Top 3

Question 1

Multiple lytic foci

Answer 1

Mets, myeloma, lymphoma (adult)

LCH, fibrous dysplasia, multifocal osteomyelitis (Child)

Question 2

Sequestrum

Answer 2

Osteomyelitis, LCH, osteoid osteoma

Also consider: lymphoma, fibrosarc

Question 3

Sacroiliitis

Answer 3

Bilat sym: AS, IBD, RA

Assymetric: Reactive, psoriatic, OA, septic

Question 4

Newborn periosteal reaction

Answer 4

Physiological, trauma, infection (osteomyelitis, TORCH, TB, syphilis)
Also consider: prostaglandins Caffey’s (infantile cortical hyperostosis - self-limiting)

Question 5

Proximal arthritis

Answer 5

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Question 6

Distal arthritis

Answer 6

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Question 7

Erosive arthropathy of foot

Answer 7

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Question 8

Chondrocalcinosis

Answer 8

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Question 9

Vertebra plana (child)

Answer 9

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Question 10

Wormian bones

Answer 10

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