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140 Cards in this Set
- Front
- Back
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Surpacondylar Process of the Humerus
Findings: large osseous projection originating from mid humerus and extending inferiorly into the arm Normal anatomic variant May cause median nerve compression ddx: NONE! This is an Aunt Minnie! |
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Aneurysmal Bone Cyst
Findings: expansile lytic lesion of the distal ulnar metaphysis well-defined margins internal septations No periostitis A result of trauma or tumor induced process ddx: Giant cell tumor Chondroblastoma Osteoblastoma Fibrous Dysplasia lytic met |
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Osteopetrosis (Marble bones, Albers- Schoenberg)
Findings: generalized increased bone density rare bone dysplasia Trabecular --> compact Anemia w/extramedullary hematopoiesis ddx: (children) pyknodysostosis renal osteodystrophy vit A, D Lead Fluorosis “Regular Sex Makes Occasional Perversions Much More Pleasurable and Fantastic” Renal Osteodystrophy Sickle Cell Disease Metastasis Osteopetrosis Pyknodysostosis Mastocytosis Myelofibrosis Paget’s Fluorinosis |
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Paget’s Disease
Findings: Enlargement of the right femoral head with course and thickend trabecula Asymmetric lucency of the right superior acetabulum ddx: NONE! This is an Aunt Minnie! |
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Brown Tumor
Findings: expansile, lytic rib lesion lytic lesion of 2nd PP subperiosteal bone resorption arterial Ca2+ Usually secondary to CRF but may be primary check for PT adenoma if on dialysis, check wrist for amyloid arthropathy (cysts in carpal bones) ddx: metastases multiple myeloma |
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Bucket-Handle Tear
Findings: “double PCL sign” - torn meniscus BELOW normal PCL on sag view Above ACL on cor view Truncation of medial meniscus Joint effusion Medial = 3x lateral Locked knee ddx: torn ACL, PCL torn meniscus |
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Ankylosing Spondylitis
Findings: fused SI joints right hip erosions lumbar syndesmophytes Sero-negative chronic inflammatory disease Starts in the low back and progesses upward ddx (sacroilitis) bilateral ank spond IBD Unilateral Reiter’s psoriasis |
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Femoral Head AVN
Findings: bilateral femoral head AVN w/o collapse right pelvic renal tx |
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Hill-Sachs Deformity and Osseous Bankart Lesion
Findings: Impaction fracture of the posterolateral humeral margin (Hill-Sachs) Fracture of the osseous glenoid rim (Bankart) secondary osteoarthritis Related to repeated anterior dislocations (shoulder instability) Bankart lesion is typically only of the cartilaginous labrum, best seen on MRI |
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Lateral Patellar Dislocation
Findings: bone bruise of lateral femoral condyle and medial patella injury of the patellar retinaculum joint effusion Patella usually dislocates lateral (medial facet more acute angle) Look for constellation of findings |
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Metastatic Renal Cell
Findings: expansile lytic lesion of the distal ulnar metaphysis well-defined margins internal septations No periostitis Don’t forget about mets! ddx: ABC Giant cell tumor Chondroblastoma Osteoblastoma Fibrous Dysplasia |
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Homolateral Lisfranc farcture/dislocation
Findings lateral subluxation of the second through fifth metatarsals dislocation is relative to the cuneiforms: homolateral divergent (1st MT medial) can be due to trauma or in patients with diabetic neuropathy |
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Osteochondritis Dissecans
Findings: defect in the medial talar dome representing an osteochondral fracture Unknown etiology but most common causes are: trauma osteonecrosis Do MRI w/ or w/o arthro to look for free fragment |
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Pellegrini-Stieda disease
Findings: Linear ossific density adjacent to the medial femoral condyle Calcification or ossification of the MCL at its insertion site Sequela of previous injury NOT acute, usually not the site of pain |
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Bilateral SCFE
Findings: posteromedial displacement of femoral epiphyses Most common cause of limp in adolescents SH-I shearing fx high incidence in black, overweight pubertal males 75% uni, 25% bi Look for line along lateral femoral neck to transect 1/6th of epiphysis Must be pinned or fixed |
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Synovial Sarcoma
Findings: Dense soft tissue mass no bony involvement heterogeneous T1 Rare soft tissue tumor of children May show calcification Internal hemorrhage and necrosis are common Found close to joints Prone to metastases ddx: (plain film only) hematoma |
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Unicameral Bone Cyst
Findings: lytic, slightly expansile lesion of the proximal metaphysis with a thin sclerotic margin and fracture a.k.a. simple bone cyst fluid-filled cavity common lesion of children, unknown etiology asymptomatic unless fracture (“fallen fragment sign”) |
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Melorheostosis
Findings: Peripheral hyperostosis of the tibia producing a wavy sclerotic diaphyseal contour Rare bone disorder of childhood “candle wax” dripping down the bone appearance presents with PAIN and joint swelling ddx: Paget’s myelofibrosis renal osteodystrophy sclerotic mets |
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Congenital Reubella w/patent ductus arteriosis
Findings: cardiomegaly, enlarged pulm arteries longitudinal striations of sclerotic and radiolucent areas at the metaphyses (“celery stalk” appearance) epiphyseal center not seen dense, irregular metaphyseal bands most common viral infxn w/bone changes (also CMV) IUGR, TTP, cataracts, sensorineural hearing loss, PDA, pulm art and Ao stenoses |
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Aneurysmal bone cyst
Findings: Lucent end of bone lesion in the proximal tibia Slightly expansile, mild periosteal reaction Fluid-fluid level on MRI ddx: Giant cell tumor Unicameral bone cyst Fibrous dysplasia Chondroblastoma (rare) |
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Inferior shoulder dislocation
Findings: Inferior dislocation of humeral head and a deep cleft in the superior portion ddx: Anterior dislocation |
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Dens metastasis C1-2 subluxation
Findings: 8mm anterior subluxation of C1 on C2 with flexion Conventional tomogram shows C2/dens lytic lesion and pathologic fracture ddx: Rheumatoid Dens fracture |
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C3 vertebra plana (multiple myeloma)
Findings: Complete compression of C3 (look at the vertebral bodies and their corresponding posterior elements!) ddx: Metastasis Kommel’s disease (if see gas and collapse) EG |
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Calcaneal stress fracture
Findings: Patchy linear and arc-like sclerosis in the posterior calcaneous ddx: NONE! This is an Aunt Minnie! |
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Enchondroma
Findings: Patchy sclerotic intramedullay lesion in the proximal tibial metadiaphysis “Rings and arcs” calcification ddx: Enchondroma with chondrosarcomatous degeneration Bone infarct |
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Cleidocranial dysplasia
Findings: Absent central portion of clavicle with rudimentary medial and lateral portions Congenital coxa vara Widened appearance of pubis (due to delayed ossification) ddx: NONE! This is an Aunt Minnie! |
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Cystercercosis
Findings: Innumerable round and oval soft tissue calcifications ddx: Diffuse dystrophic or metastatic calcifications |
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Giant cell tumor
Findings: Expansile lucent lesion in the fibular head containing multiple thin septa ddx: Aneurysmal bone cyst Fibrous dysplasia Lytic metastasis Brown tumor Chondroblastoma (rare) |
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Hypertrophic Osteoarthritis
Findings: Diffuse symmetrical periosteal reaction of the distal radius, ulna, and tibia ddx: Adults Pulmonary Pachydermoperiostitis Vascular insufficiency Thyroid acropachy Fluorosis Peds Caffey disease Leukemia Rickets Hypervitaminosis A |
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Hyperparathyroidism
Findings: “salt and pepper” skull Osteopenia with course trabecula Subperiosteal resorption ddx: NONE! This is an Aunt Minnie! |
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Tumoral Calcinosis
Findings: Multiple dense calcifications around the joints of the fingers and wrists ddx: (soft tissue Ca2+) Renal osteodystrophy Heterotopic ossification Metastatic Ca2+ Milk-alkali syndrome Hypervitaminosis D Scleroderma Dermatomyositis |
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Osteomalacia w/ Looser’s zone
Findings: Osteopenia Horizontal linear lucency in the medial femoral metaphysis Causes: Renal osteodystrophy Hyperparathyroidism Vit D deficiency ddx: NONE! This is an Aunt Minnie! |
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Knee fracture
Findings: Lipohemarthrosis No visible fracture but one is definitely present ddx: NONE! This is an Aunt Minnie! |
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Osteochondromatosis
Findings: Flared metaphyses due to multiple bony outgrowths = exostoses Contiguous with cortex and medulla Point away from joint Look for pain (after bony maturation) – check cartilagenous cap = >2cm, risk of chondrosarcoma ddx: NONE! This is an Aunt Minnie! |
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Paget’s Disease w/ sarcomatous degeneration
Findings: Cortical thickening with mixed lytic and sclerotic trabecular pattern and bony enlargement Large lytic lesion of the right ilium and sacral ala ddx: Diffuse sclerotic and lytic mets |
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Rickets
Findings: Cupped and frayed metaphyses Wide physes (increased osteoid) Long bone bowing Decreased bone density ddx: NONE! This is an Aunt Minnie! |
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Bilateral perched lumbar facets
Findings: Mild anterolisthesis of L4 on L5 Inferior L4 facets perched on superior L5 facets ddx: NONE! This is an Aunt Minnie! |
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Rheumatoid arthritis
Findings: Destruction of the dens and the anterior C1 arch by a soft tissue mass Impression of the anterior thecal sac with slight deformation of the cervical cord ddx: Infection Metastasis |
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Septic Arthritis
Findings: Lytic and sclerotic destruction of the great toe MTP joint Joint space narrowing Periosteal reaction Soft tissue swelling ddx: Charcot joint Metastasis with pathologic fractures |
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Potts Disease
Findings: Complete collapse of L4 and cauda equina compression Subligamentous soft tissue extension to L3 body ddx: Staph aurius Gram negatives (IVDA) |
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Enchondroma
Findings: Lucent, slightly expansile lesion of the fifth MC ddx: Giant cell tumor UBC Fibrous dysplasia |
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Discitis
Findings: T12-L1 disc space narrowing with endplate destruction CT demonstrates presence of gas ddx: NONE! This is an Aunt Minnie! |
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Right hip synovitis
Findings: Asymmetric teardrop distance (greater on right) Normal joint space ddx: Infection Rheumatoid |
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Osteogenesis Imperfecta Type II
Findings: multiple fractures, bowing and short ribbon-like bones Type II - lethal - “ribbon bones” and fractures too numerous to count Disturbances in type I collagen lack of normal collagen osteoperosis fractures blue sclera ddx: NONE! This is an Aunt Minnie! |
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Polyostotic fibrous dysplasia
Findings: Multiple lucent and expansile lesions “ground glass matrix” May be seen on precocious puberty – McCune Albright syndrom ddx: Multiple enchondromas |
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Renal osteodystrophy
Findings: Osteopenia Prominent trabecular pattern “rugger jersey” spine ddx: NONE! This is an Aunt Minnie! |
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Eosinophilic Granuloma
Findings: Well-defined lytic lesion in the frontal skull crossing the diploic space Overlying scalp swelling Positive bone scan ddx: Osteomyelitis Metastasis |
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Prostate metastases
Findings: Diffuse sclerosis ddx: Breat, GI mets myelofibrosis renal osteodystrophy osteopetrosis multiple myeloma |
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Atlanto-occipital dislocation
Findings: anterior and superior displacement of occipital condyles in relation to C1 pre-vertebral soft tissue swelling mechanism: hyperflexion or hyperextension UNSTABLE |
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Bilateral jumped facets
Findings: complete anterior dislocation of C5 on C6 locked bilateral facets disruption of ALL & PLL “bat wing” appearance mechanism: extreme hyperflexion UNSTABLE |
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Unilateral jumped facet
Findings: anterolisthesis of C5 on C6, less than 50% discordant rotation (C2-5 bodies appear smaller than C6-7) C5 inferior facet perched on C6 superior facet mechanism: flexion and rotation STABLE |
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Flexion teardrop fracture
Findings: anterior teardrop fragment of C5 prevertebral soft tissue swelling widening of C5-C6 interspinous distance mechanism: hyperflexion and compression (diving accident) UNSTABLE |
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Hangman’s fracture
Findings: bilateral C2 pars fractires anterolisthesis and forward tilting of the C2 body prevertebral soft tissue swelling may see avulsion of anterior inferior C2 mechanism: hyperextension UNSTABLE |
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Jefferson fracture
Findings: burst fracture of C1 lateral view: lateral displacement of lateral masses > 2mm mechanism: axial load injury UNSTABLE |
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Odontoid fracture
Findings: base of dens fracture anterior and superior distraction of dens and atlas prevertebral soft tissue swelling mechanism: hyperflexion UNSTABLE |
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Anterior shoulder dislocation
Findings: inferomedial, subcoracoid position of the humeral head too much overlap of humeral head and glenoid axillary view shows Hill Sachs - Bankhart configuration ddx: NONE! This is an Aunt Minnie! |
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Bennett Fracture
Findings: Vertical oblique intra-articular fracture at the base of the thumb MC Radial subluxation of distal fragment must be fixed surgically ddx: NONE! This is an Aunt Minnie! |
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Chauffer’s fracture (Hutchinson fracture)
Findings: intra-articular radial styloid fracture mild widening of SL distance direct injury to the thenar side of wrist ddx: NONE! This is an Aunt Minnie! |
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Radial head fracture
Findings: Visualization of both the anterior and posterior fat “spinnaker sign” most common adult elbow fracture assume radial head fracture even if not clearly seen ddx: NONE! This is an Aunt Minnie! |
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Capitellum fracture- dislocation
Findings: fracture-dislocation of the capitellum due to direct trauma second most common site in kids (most common is suprcondylar) ddx: NONE! This is an Aunt Minnie! |
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Medial epicondyle fracture (Little Leaguer’s elbow)
Findings: small avulsion of the medial epicondyle due to large valgus forces little league pitchers ddx: NONE! This is an Aunt Minnie! |
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Galeazzi fracture-dislocation
Findings: Angulated distal radius and ulna fractures Distal ulnar dislocation ddx: NONE! This is an Aunt Minnie! |
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Monteggia fracture- dislocation
Findings: Overlapping, angulated fracture of the proximal ulna radial head dislocation ddx: NONE! This is an Aunt Minnie! |
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Rolando fracture
Findings: comminuted intra-articular fracture of the thumb MC ddx: NONE! This is an Aunt Minnie! |
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Nail bed injury
Findings: incomplete fracture of the dorsal distal phalanx involves the nail bed treat as open fracture high risk of osteomyelitis ddx: NONE! This is an Aunt Minnie! |
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Dialysis arthropathy
Findings: Multiple erosions on both sides of multiple PIP joints Osteopenia, fuzzy trabecula, and dialysis graft = evidence of ESRD ddx: Inflammatory arthritis |
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Femoral Head AVN with collapse
Findings: Mixed sclerotic and lytic appearance of the femoral head 2 mm collapse of the superior articular surface Joint space still preserved ddx: NONE! This is an Aunt Minnie! |
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Hemophilia
Findings: Severe secondary arthritis of the ankle ddx: Inflammatory Post-infectious |
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Juvenile Rheumatoid Arthritis
Findings: Flared metaphyses Gracile diaphyses Joint space narrowing Abnormal patellae ddx: NONE! This is an Aunt Minnie! |
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Inflammatory Arthritis
Findings: Severe joint space narrowing Sub-chondral cystic changes and sclerosis No significant osteophyte formation ddx: Post-infectious |
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Odontoid fracture with C1 subluxation
Findings: 5mm anterior subluxation of C1 relative to C2 with flexion ddx: Destroyed dens Rheumatoid Metastasis |
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Synovial chondromatosis
Findings: Smoothly marginated erosions on both sides of the 4th MCP joint Soft tissue mass causing narrowing of the 4th MC Single joint involvement ddx: Rheumatoid PVNS |
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Hyperparthyroidism
Findings: Subperiosteal absorption along the medial aspect of the proximal tibial metadiaphysis Subligamentous resorption at the attachments of patellar ligament ddx: NONE! This is an Aunt Minnie! |
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Rheumatoid Arthritis
Findings: Deformed elbow joint due to complete loss of articular cartilage and large erosions Soft tissue pannus within the joint ddx: NONE! This is an Aunt Minnie! |
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Lipoma arborescens
Findings: Fatty lesion within the suprapatellar pouch ddx: NONE! This is an Aunt Minnie! |
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Enchondroma
Findings: Bone forming lesion in the medullary space of the humeral metadiaphysis Rings and arcs calcification ddx: Bone infarction |
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Osteoid osteoma
Findings: Small lucent lesion with surrounding sclerosis within femoral neck ddx: Brodie’s abscess EG |
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Aneurysmal bone cyst
Findings: Eccentric metadiaphyseal lucent lesion with a thin sclerotic margin and fine internal septa ddx: Fibrous dysplasia Chondromyxoid fibroma GCT, chondroblastoma (if physis closed) |
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Adamantinoma
Findings: Expansile mixed lytic and sclerotic lesion of the tibial midshaft Cortical disruption and periosteal reaction ddx: Fibrous dysplasia |
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Avulsion injury
Findings: Soft tissue calcification along the superior anterior acetabulum No cortical involvement Normal joint space ddx: Myositis ossificans Parosteal osteosarcoma |
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Brodie’s abscess
Findings: Well-defined lytic lesion in the metaphysis Large zone of surrounding sclerosis CT is diagnostic of a fluid filled lesion ddx: Osteoblastoma Langerhan’s cell histiocytosis |
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Calcaneal Ewing’s sarcoma
Findings: Permeative lesion in the calcaneous Cortical disruption and slight periosteal reaction ddx: Lymphoma Metastasis/myeloma Infection Langerhan’s cell histiocytosis |
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Chondromyxoid fibroma
Findings: Well-defined eccentric lucent lesion Cortical thinning Narrow zone of transition ddx: ABC Infection Fibrous dysplasia Giant cell tumor (if physis closed) Non-ossifying fibroma (if sclerotic margin) |
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Cortical desmoid
Findings: Irregular cortical thickening of the posterior (medial) distal femur Avulsion injury related to the medial gastrocnemius ddx: Parosteal osteosarcoma Myositis ossificans |
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Langerhan’s cell histiocytosis
Findings: Predominantly lytic lesion of the tibia with cortical thickening, periosteal reaction, and soft tissue swelling and edema ddx: Infection Ewing’s sarcoma Lymphoma |
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Enchondroma
Findings: Intramedullary lesion containing calcified chondroid matrix Endosteal scalloping ddx: Chondrosarcoma Bone infarct |
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Calcaneal UBC
Findings: Central lucent lesion within the calcaneous Fine sclerotic margin ddx: Intraosseous lipoma |
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Ewing’s sarcoma
Findings: Permeative diaphyseal lesion with intense periosteal reaction and soft tissue swelling ddx: Osteomyelitis Langerhan’s cell histiocytosis Lymphoma |
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Fibrous dysplasia
Findings: Mixed sclerotic and lytic lesion of the left hemipelvis and proximal femur “shepherd's crook sign” ddx: NONE! This is an Aunt Minnie! |
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Gaucher’s disease
Findings: Flask-shaped long bones = undertubulation Varied appearance includes multiple lucent lesions and bone infarcts ddx: other glycogen storage dz |
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Scapular metastasis
Findings: Soft tissue mass of the right shoulder with destruction of the adjacent scapula ddx: Soft tissue sarcoma |
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Mafucci syndrome
Findings: Multiple enchondromas and soft tissue hemangiomas ddx: NONE! This is an Aunt Minnie! |
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Giant cell tumor
Findings: End of bone lucent and expansile lesion with a narrow zone of transition No periosteal reaction or soft tissue mass ddx: ABC metastasis chondroblastoma |
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Multiple myeloma
Findings: Numerous punched out lytic lesions involving multiple bones ddx: Metastases |
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Osteoma
Findings: Well-defined lesion of compact bone involving the left ileum No change over many years ddx: Sclerotic metastasis |
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Lymphoma
Findings: Permeative lesion of the proximal humerus ddx: Multiple myeloma Metastasis MFH Infection Langerhan’s cell histiocytosis |
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Non-ossifying fibroma
Findings: Well-defined lucent cortical lesion Sclerotic margin No periosteal reaction or soft tissue mass ddx: Fibrous dysplasia Langerhan’s cell histiocytosis ABC |
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Neurofibromatosis Type I
Findings: Enlargement of multiple neural foramina and scalloping of the posterior vertebral bodies ddx: NONE! This is an aunt Minnie! |
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Malignant fibrous histiocytoma
Findings: Permeative lesion of the superior pubic ramus ddx: Lymphoma Multiple myeloma Metastasis Osteomyelitis |
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Fibrous dysplasia
Findings: Long lytic lesion in a long bone Cortical thickening “ground glass matrix” ddx: NONE! This is an Aunt Minnie! |
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Chondrosarcoma
Findings: Large bone-forming soft tissue mass centered in the right SI joint “ring and arc Ca2+” = calcified chondroid matrix ddx: NONE! This is an Aunt Minnie! |
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Osteosarcoma
Findings: Aggressive lesion of the distal tibia in a skeletally immature person “cloud-like” appearance = calcified osteoid matrix Intense periosteal reaction Soft tissue mass ddx: NONE! This is an Aunt Minnie! |
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Parosteal osteosarcoma
Findings: Dense lobular lesion along the medial proximal humerus No apparent cortical destruction (check w/ CT) ddx: NONE! This is an Aunt Minnie! |
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Osteopoikelosis
Findings: Innumerable round and oval sclerotic lesions involving multiple bones No cortical destruction, periosteal reaction, or soft tissue mass ddx: NONE! This is an Aunt Minnie! |
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Hemangioma
Findings: Sclerotic expansile lesion of the right hemipelvis “Irish lace” appearance on CT ddx: NONE! This is an Aunt Minnie! |
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Stress fracture
Findings: Slightly angulated fracture of the distal 3rd metatarsal Periosteal reaction Surrounding calcified osteoid matrix = callus ddx: Osteosarcoma with pathologic fracture |
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Periosteal osteosarcoma
Findings: Lucent juxtacortical fusiform mass along the diaphyseal surface Spiculated perpendicular periosteal reaction = “sunburst” Lack of medullary involvement ddx: Osteomyelitis Langerhan’s cell histiocytosis Ewing’s sarcoma |
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Synovial osteochondromatosis
Findings: Multiple round calcified masses in the joint space Erosions on both sides of the joint Single joint involvement ddx: Primary (idiopathic) Secondary to OA |
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Giant cell tumor
Findings: End of bone, eccentric, lucent lesion with narrow zone of transition but no sclerotic margin ddx: Fibrous dysplasia ABC Chondroblastoma |
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Osteosarcoma
Findings: lytic lesion of the anterior proximal tibia cortical breakthrough and a soft tissue mass ddx: metastasis infection Langerhan’s cell histiocytosis |
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Severe OA & Geode
Findings: severe osteoarthritis of the right hip lytic lesion in the adjacent superior acetabulum hot on bone scan ddx: fibrous dysplasia ABC infection erosion |
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Neurofibromatosis type I
Findings: partially empty orbit = sphenoid wing dysplasia ddx: lytic metastasis osteomyelitis |
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Giant cell tumor
Findings: soft tissue mass destroying the tuft ddx: osteomyelitis metastasis chondrosarcoma |
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Tug lesion (avulsion injury)
Findings: Cortical thickening and irregularity along the posterior medial distal femur CT is diagnostic ddx: parosteal osteosarcoma myositis ossificans |
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Unicameral bone cyst
Findings: expansile central lesion of the proximal humerus Fluid signal, no cortical breakthrough, or soft tissue mass ddx: NONE! This is an Aunt Minnie! |
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Hemangioma
Findings: expansile lesion of the proximal tibia containing fine bony septations and a large course calcification CT scan shows a lacey appearance ddx: Paget’s dz ABC |
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Chordoma
Findings: Large destruction lesion in the deep pelvis high T2 signal hot on bone scan ddx: chondrosarcoma teratoma metastasis |
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Healing stress fracture
Findings: Fluffy density overlying the left inferior pubic ramus ddx: chondrosarcoma parosteal osteosarcoma myositis ossificans |
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Osteosarcoma
Findings: Bone forming lesion of the proximal tibia in a skeletally mature patient fluffy and cloud-like calcified matrix ddx: NONE! This is an Aunt Minnie! |
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UBC & pathologic fracture
Findings: central lucent lesion with a narrow zone of transition complicated by a pathologic fracture ddx: NONE! This is an Aunt Minnie! |
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Hamate fracute
Findings: Oblique fracture through the hook of the hamate ddx: NONE! This is an Aunt Minnie! |
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Partial ACL tear
Findings: Contour irregularity and increased signal of the ACL ddx: NONE! This is an Aunt Minnie! |
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Synovial osteochondromatosis
Findings: Multiple small round and oval foci of low T2 signal within the anterior ankle joint space Single joint involvement ddx: NONE! This is an Aunt Minnie! |
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Fracture of the lateral talar facet
Findings: Small osseous fragment in the lateral ankle and soft tissue swelling Donor site is the lateral talus Due to dorsiflexion and inversion = common snowboarding injry |
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Spontaneous osteonecrosis of the knee (SONK)
Findings: Cartilage defect, flattening, and bone marrow edema of the medial femoral condyle ddx: trauma |
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Os acromiale
Findings: Unfused acromial apophysis Complete acromioscapular joint Normal variant ddx: NONE! This is an Aunt Minnie! |
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Rheumatoid arthritis
Findings: Soft tissue fills the knee joints space and a large Baker’s cyst Marginal erosions, cartilage loss, and ACL rupture ddx: NONE! This is an Aunt Minnie! |
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Complete ACL tear
Findings: Increased signal and thickness in region of ACL Horizontal position of anterior component ddx: NONE! This is an Aunt Minnie! |
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Pivot shift injury
Findings: Bone marrow edema of the lateral femoral condyle and posterior lateral tibial plateau ddx: NONE! This is an Aunt Minnie! |
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Medial collateral ligament tear
Findings: Disruption of medial collateral ligament with surrounding edema signal Increased signal in the intercondylar notch = ACL injury, possible tear ddx: NONE! This is an Aunt Minnie! |
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Complete PCL tear
Findings: Enlargement and increased signal in the posterior PCL Large joint effusion ddx: NONE! This is an Aunt Minnie! |
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SLAP tear & paralabral cyst
Findings: MR arthrogram show increased signal of the superior labrum Anterior to posterior tear Paralabral cystic lesion ddx: NONE! This is an Aunt Minnie! |
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Osteomyelitis
Findings: Multiple fluid collections with surrounding rim enhancement within the medullary space Diaphyseal fracture with surrounding periosteal reaction and extensive soft tisse involvement ddx: Langerhan’s cell histiocytosis |
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Osteochondroma
Findings: Bony exostosis along the posterolateral distal femur pointing away from the joint Contiguity of the cortex and medullary space ddx: NONE! This is an Aunt Minnie! |
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Osteochondral dissicans
Findings: CT arthrogram shows a well-defined dense bony fragment of the medial talar dome Overlying cartilage is intact (no seepage of contrast below fragment) ddx: NONE! This is an Aunt Minnie! |
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Hill-Sachs lesion
Findings: MR arthrogram shows a cortical defect along the posterior lateral margin of the superior humeral head ddx: NONE! This is an Aunt Minnie! |
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Medial cruciate ligament tear & paralabral cyst
Findings: Thinning and increased signal of the medial cruciate ligament Oval T2 bright lesion adjacent to posterior lateral horn of MCL ddx: NONE! This is an Aunt Minnie! |
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Bilateral AVN
Findings: Serpentine areas of low T1 signal in both femoral heads No evidence of collapse ddx: NONE! This is an Aunt Minnie! |
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Achilles tendinopathy
Findings: Thickening and increased signal of the Achilles tendon Most prominent at the musculotendinous junction ddx: NONE! This is an Aunt Minnie! |
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Giant cell tumor
Findings: Well defined bright T2 lesion in the medial femoral condyle abutting the articular suface ddx: Subchondral cyst Chondroblastoma ABC |
