Msk Review 2

Front 1

lipoma arborescens

Back 1

fond like excrescences that have fat signal on all sequences.

Front 2

classic appearance of hte endosteum in chondrosarcoma

Back 2

endosteal scalloping (hallmark feature)- lesion is trying to get to the soft tissue but the bone is trying to contain it

cortical thickening

Front 3

what is the "classic" appearance of a neurofibroma

Back 3

target sign on T2WI, low signal centrally, high signal peripherally

Front 4

one way to differentiate between ewing and osteosarcoma

Back 4

ewing sarcoma does not have reactive bone formation in teh soft tissues, if there is, it must be osteosarcoma
central diaphysis - ewing
osteosarcoma - in the metaphysis/epiphysis

Front 5

focal marrow infiltration - another name

Back 5

focal nodular hyperplasia

Front 6

how to differentiate between focal marrow infiltration, red marrow stimulation, and mets/myeloma

Back 6

focal marrow infiltration - has minimal enhancement
red marrow stimulation may have intense pet uptake and mild enhancement
mets/myeloma: would be bright on T2 and have enhancement

Front 7

classic findings of hyperpth

Back 7

subperiosteal bone resorption
brown tumors
acro-osteolysis, tufts
coarsened trabeculae

Front 8

intramuscular myxoma

Back 8

located within the muscle, fluid signal on T1 and T2l slight enhancement if there is debris within it
may be surrounded by a rim of fat at the superior and inferior pole s

Front 9

mazabraud's syndrome

Back 9

intramuscular myxomas + fibrous dysplasia

Front 10

ddx for bone infarct etiologies

Back 10

ASEPTIC
Alcoholism
Sickle Cell
Exog. steroids
Pancreatitis
Trauma
Idiopathic
Caisson disease

Front 11

types of femoroacetabular impingement

Back 11

cam
pincer
combo

Front 12

cam type femoroacetabular impingement

Back 12

abutmnet of abnormally shaped femoral heads against the acetabular rim

Front 13

pincer type femoroacetabular impingement

Back 13

acetabular overcoverage, limiting hip motion

Front 14

calcar

Back 14

dense vertically oriented bone in the posteromedial region of the fmoral shaft, superior to the lesser trochanger of the femur

Front 15

most common site of insufficiency fx in the hip in runners

Back 15

basicervical region

Front 16

osteofibrous dysplasia imaging features

Back 16

diaphsysis
cortically based geographic lesion originating
ground glass on XR
thin cortex
on MR, uniform hyperintensity on fluid sensitive sequences

Front 17

who gets osteofibrous dysplaisa

Back 17

<5yo

Front 18

parsonage turner syndrome

Back 18

acute brachial neuritis (viral) -->
atrophy of the supraspinatus and infraspinatus +/-deltoid atrophy

Front 19

quadrilateral space syndrome

Back 19

axillary nerve compression or injury 2/2 fibrous band, osteophyte, or paralabral cyst that affect axillary nerve
--> teres minor and deltoid muscle denervation edema/atrophy
compression of posterior humeral circumflex artery

Front 20

spinoglenoid notch syndrome

Back 20

paralabral cyst or other mass lesion --> supra and/or infrapinatus atrophy

Front 21

classic findings of psoriatic arthritis

Back 21

STS
periostitis
marginal erosions
pencil-in-cup erosions
b/l, asymm
hands>feet>SIJ, spine

Front 22

ddx periotstitis in arthritis in teh foot

Back 22

chronic reactive arthritis
psoriatic

Front 23

t or f: periostitis is commonly seen in RA

Back 23

false

Front 24

features of ractive arthritis (aka reiter's disase)

Back 24

sts
periosteal rxn
ill-defined erosions
b/l asymm

very similar to psoriatic, except no pencil in cup deformtiy

Front 25

t or f:Egran can have ST mass and cortical breakthrough

Back 25

true

Front 26

appearance of juvenile idiopathic arthriti in teh spine

Back 26

complete fusion of cervical facet joints
fusion of vertebral bodies that are hypoplastic (indicates it occurred in childhood)
lower c spine usually spared
apophyseal joints are decreased in size
loss of disk space height

Front 27

how does juvenile idiopathic arthritis differ from juvenile onset ank spond

Back 27

the vertebral bodies are more nml in size in ank spond b/c the ankylosis of the apophyseal joints happens at an older age

Front 28

klippel-feil syndrome

Back 28

congenital fusion of any 2 cervical vertebrae with associated segmentation defect in c spine

Front 29

XR findings of leukemia (systemic)

Back 29

diffuse osteopenia
lucent metaphyseal bands (= rapid development of osteopenia)

Front 30

how to differentiate IBD arthropathy from ank spond

Back 30

looks the same in teh spine

Front 31

appearance of ank spond in the spine

Back 31

osteoporosis
fusion of vert bodies and posterior elements

Front 32

what is giant cell tumor of the tendon sheath

Back 32

benign synovial proliferation within tendon sheath, most commonly involving the fingers

Front 33

location of giant cell of the tumor sheath

Back 33

lobulated soft tissue mass immediately adjacent to tendon, most common in hands
XR: ST fullness, cortical scalloping that mimics erosions may be present
MR: hypo/intermed T1, low to intermed T2 +intense enhancement
cartilage space is nml

Front 34

haglund syndrome

Back 34

haglund deformity (enlarged superior margin of calcanal posterior process)
insertional tendinopathy of achilles
pre-achilles bursitis

Front 35

what happens when intraosseous lipomas age

Back 35

they involute and may calcify

Front 36

how to guage BM on spine mr

Back 36

vertebral body marrow should never be lower sitnal than adjacent disks on T1

Front 37

which sarcoma has a predilection for flat bones

Back 37

ewing sarcoma

Front 38

which lesions predominantly involve posterior element of the spine

Back 38

osteoblastom a
ABC
osteoid osteoma
MM
mets

Front 39

which lesions involve vert body

Back 39

chordoma
giant cell tumor
e gran
ewing sarcoma
lymphoma
mets
myeloma

Front 40

classic findings of gout on XR

Back 40

well defined erosions with overhanging edges
ST masses
joint space preservation
over-hanging edges
punched out erosions with sclerotic borders

Front 41

what causes the overhanging edges in gout

Back 41

extra bone tries to surround erosions

Front 42

appearance of lipomatosis on the median nerve

Back 42

fatty stroma surrounding puncatte areas of low signal

Front 43

which nerve is most common location for lipomatosis

Back 43

median nerve

Front 44

b/l olecrenon bursitis

Back 44

gout

Front 45

common finding seen in new onset flat-foot

Back 45

tear of the posterior tibilias tendon

Front 46

when to think about a periosteal chondroma

Back 46

lesion arising on teh surface of a metadiaphysis that contains matrix

Front 47

SAPHO

Back 47

synovitis
acne
pustulosis
hyperostosis
osteitis