Lower limb pathologies summary

Question 1

Well-circumscribed lucency

Answer 1

Bone cysts

Question 2

Pathology of femoropatellar joint space, possible misalignment of patella

Answer 2

Chondromalacia patellae

Question 3

Bone destruction with calcifications in the cartilaginous tumor

Answer 3

Chondrosarcoma

Question 4

Well-defined radiolucent tumor with thin cortex

Answer 4

Enchondroma

Question 5

Ill-defined area of bone destruction with surrounding “onion peel”

Answer 5

Ewing’s sarcoma

Question 6

Projection of bone with cartilaginous cap, grows parallel to shaft and away from nearest joint

Answer 6

Exotosis (osteochondroma)

Question 7

uric acid deposits in joint space; destruction of joint space

Answer 7

Gout

Question 8

Abnormal separation or avulsion fx. between base of first and second metatarsals and cuneiforms

Answer 8

Lisfranc joint injury

Question 9

Multiple “punched-out” osteolyte lesions throughout affected bone

Answer 9

multiple myloma

Question 10

Fragmentation and/or detachment of tibial tuberosity by patellar tendon

Answer 10

Osgood-Schlatter disease

Question 11

Narrowed, irregular joint spaces with sclerotic articular surfaces and spurs

Answer 11

Osteoarthritis (DJD)

Question 12

Large radiolucent lesions with thin strips of bone between

Answer 12

Osteoclastoma

Question 13

Extensively destructive lesion with irregular periosteal reaction; classic appearance is sunburst pattern that is diffuse periosteal reaction

Answer 13

Osteogenic sarcoma

Question 14

Small, round-oval density with lucent center

Answer 14

Osteoid osteoma

Question 15

Decreased bone density, bowing deformity in weight-bearing limbs

Answer 15

Osteomalacia (-)

Question 16

Mixed areas of sclerotic and cortical thickening and lytic or radiolucent lesions; cotton wool appearance

Answer 16

Paget’s disease (osteitis deformans)

Question 17

Asymmetric erosion of joint spaces; calcaneus erosion, usually bilateral

Answer 17

Reiter syndromes