HIGH YIELD II

Question 1

the tumor margin and contour that is permeative and ill defined is?

Answer 1

malignant

Question 2

more common than primary bone neoplasms?

Answer 2

metastatic

Question 3

associated with Gardners syndrome?

Answer 3

osteoma

Question 4

<2 cm in greatest dimension

femur and tibia most common

relieved by ASA

rim of sclerotic bone at edge with nidus

Answer 4

osteoid osteoma

Question 5

histologically and radiographically identical to OO

> 2 cm

vertebral column most common site

not relieved by ASA

Answer 5

osteoblastoma

Question 6

malignant mesenchymal neoplasm; 2nd most common malignant bone tumor

most common site of metastasis is the lungs via hematogenous spread

note: secondary arises from pagets disease and comes from osteochondroma

knee is most common location, codmans triangle, osteoid produced by malignant cells

Answer 6

osteosarcoma, note that knee is most common

Question 7

exostoses
benign
morphology: hyaline cartilage, arise from metaphysis, near growth plate of long bones, bony projections anchored to cortex

Answer 7

osteochondroma

Question 8

benign, mature hyaline cartilage

small bones of hands and feet

Ollie disease and maffucci syndrome can occur

Answer 8

chondroma (enchondroma)

Question 9

rare, benign tumor
young patients, 2nd decade
epiphysis of proximal humerus and distal femur

highly cellular

Answer 9

chondroblastoma

Question 10

malignant neoplasm in which mesenchymal cells produce cartilaginous matrix

skeletal distribution dominant in:
shoulder
pelvis
proximal femur
ribs
vertebrae

assoc with many chondromas

***blue gray cut surface

Answer 10

chondrosarcoma

Question 11

normal trabecular bone replaced by proliferation of fibrous tissue and disorderly islands of malformed bone

uncommon, benign
localized
monostotic
polystotic
polystotic disease w/ endocrine abnormalities (mccune Albright)

radiolucent
surrounded by thin layer of sclerotic bone
irregular, curvilinear islands of woven bone

Answer 11

fibrous dysplasia

Question 12

benign but locally aggressive

3-5th decade

epiphyses of long bones, distal femur, proximal tibia

pain, swelling, pathologic fx

radiolucent, solitary, erode through cortex, multinucleate giant cells

Answer 12

giant cell tumor of bone

Question 13

malignant, small round blue cell tumor

peaks in 2nd decade, arises within cavity in diaphysis of long bone, sites are femur, tibia, and pelvis

painful, enlarging masses, onion skin, periosteal Ron, 75% 5 yr survival

uniform, small, round blue cells; cytoplasm scant, no osteoid production, CD99 positive

Answer 13

Ewing sarcoma