MSK Flashcards

1
Q
A

Erlenmeyer Flask

Thalaseamia: coarsened trabeculation producing a ‘cobweb’ appearance.

Osteopetrosis

Pyle disease/ Pick disease

D

OI

Gaucher: osteopenia and pencil thin cortices. Hepatosplenomegaly

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2
Q

Erlenmeyer flask deformity, ‘sandwich vertebrae’ and
‘bone within bone’ appearance

A

osteopetrosis.

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3
Q

Soft tissue calcification

A
  1. Tumoral calcinosis
  2. Haematoma
  3. Myositis ossificans
  4. Crystal arthropathy
  5. Scleroderma
  6. Dermatomyositis: Sheets of Ca.
  7. Synovial osteochondromatosis
  8. Synovial sarcoma
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4
Q

Expansile lytic bone lesion, B9

A
  1. Fibrous dysplasia: GG +/- Ca++
  2. ABC:
    • Posterior elements of the spine.
    • soap bubble.
    • Fluid fluid level
  3. Unicameral bone cyst
    • central location and expansion.
    • Thin sclerotic rim
  4. GCT
    • epiphyseal extension
    • septation
    • eccenteric location
  5. EG:
    • well-defined areas of cortical or medullary rarefaction;
    • in the later stages, there may be a sclerotic margin, periosteal reaction, and bone expansion.
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5
Q

A 71-year-old man with shoulder pain and swelling

A
  1. Synovial osteochondromatosis
    • multiple, round, similar-sized calcified bodies.
    • Treatment is resec- tion of the bodies along with synovectomy. Recurrences after surgical debridement can occur.
  2. PVNS:
    • MRI: Joint effusion and focal or diffuse synovial thickening that is low signal on T1 and T2 because of hemosiderin deposition.
    • The hemosiderin causes susceptibility artifact and blooming on gradient-echo sequences.
    • Treatment is synovectomy; incomplete resection is associated with high recurrence rates.
  3. Rice bodies:
    1. RA
    2. resembles rice grains
    3. low T2, joint effusion, synovial hypertrophy and synovial enhancement.
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6
Q

A 49-year-old woman with chronic bilateral hand pain and

ulcerations

A

Acro-osteolysis:

  1. Hyper - PTH:
    • Subperiosteal resorption of bone, especially along the radial aspect of the second and third middle phalanges of the hands, is virtually diagnostic
    • resorption of the distal clavicles,
    • “rugger-jersey” spine,
    • brown tumors, and
    • resorption of the terminal phalanges.
  2. Scleroderma: soft-tissue resorption and calcifications with distal phalangeal acro-osteolysis. CREST syndrome.
  3. Trauma: Frost-bite, burn injury.
  4. Psoriasis:
    • DIP
    • soft tissue swelling. peri-articular erosion, fluffy periostitis
    • sausage digit
    • pencil in cup deformity
  5. Hajdu-Cheney Syndrome- AD
    • enlarged sella
    • wormian bones
    • basilar invagination
    • hearing and speach impairment
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