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28 Cards in this Set

  • Front
  • Back
intense night pain
osteoid osteoma
osteoid osteoma: MC site
appendicular skeleton (cortical of femur and tibia)
osteoblastoma: MC site
spine
nidus
actual tumor in osteoid osteoma, surrounded by bone sclerosis
cancerous bone produce bone matrix-
malignant osteoid

-found in osteosarcoma
bone tumor in teenagers
osteosarcoma
EXAM-site for osteosarcoma
metaphysis of long bone
*around the knee (Goljan-distal femur & prox tibia)
-hip, prox humerus, craniofacial bones

*invades medullary canal, SPARES THE GROWTH PLATE
Codman's triangle--EXAM
Osteosarcoma

Codman's triangle=raised periosteum/cortex
osteochrondroma
-cartilage-capped bony outgrowth attached by stalk
-mushroom
how distinguish b/w chondroma and chondrosarcoma
chondrosarcoma has cortical destruction, whereas chondroma does not
EXAM-Ollier Dz
=multiple enchondromatosis

(enchondroma=intramedullary chondoma)
MC type of chondroma?
enchondroma (=intramedually chondroma)
maffucci dz
multiple enchondromatosis + soft tissue hemangiomas
chondroma: site?
metaphysis of tubular bones, esp small bones of hands and feet
"O-ring sign"
seen in chondroma

(o-ring sign=thin rim of radiodense bone around cartilage lobules)
chondrosarcoma: site?
central skeleton (pelvis, shoulder, ribs)

+ prox extremities (vs. osteosarcoma: metaphysis of long bones)
grades of chondrosarcoma
Grade 1: hyaline matrix
Grade 2: myxoid matrix, increased cellularity, mitoses

Grade 3: little matrix, pleomorphism
conventional type of chondrosarcoma does what?
produces hyaline matrix
prognosis of chrondrosarcoma
metastastis to lungs and bones
fibrous cortical defect:
site?
what happens?
fibrous cortical defect AKA
non-ossifying fibroma
("non-ossifying fibroma" is used when lesion extends into medullary canal)

site: eccentric metaphyseal lesion in distal femus and prox tibia
fibrous dysplasia:
-what happens
-types
halts bone formation

*MC=monostotic (one bone)
-growth stops with closure of growth plates

-Polystotic (>1 bone)
*"Shepherd's crook" deformity of prox femur

-McCune albright
*rare
*polyostotic fibrous dysplayer + endocrine abnl (precocious puberty)
PNET
-how look?
-genetics?
small round cell tumor
primitive phenotype

t(11:22)
t(11:22)
PNET AKA Ewing Sarcoma
X-ray shows "onion skin"
Ewing Sarcoma AKA PNET

mneum: "You eat 11 peanuts, and 22 onions"
MC bone malignancy
metastatic
how do tumors metastasize to bone?
hematogenously
EXAM-which tumors metastasize to bone?
adults:
prostate, breast, kidney, lung

kids:
osteosarcoma, rhabdomyosarcoma

neuroblastoma
Ewings (PNET)
Wilms tumor
X-ray of Ewings?
(Ewing=PNET)

Types:
lytic
blastic
mixed = MC