Practice writtens

Question 1

Chondroblastoma

Answer 1

Benign epiphyseal (eccentric) cartilaginous neoplasm, cystic
Thin sclerotic margin
Joint effusion in 1/3
Young patients male predominant
May have secondary ABC
Chicken-wire calcification pathognomonic
70% humerus, femur, tibia. 10% hands and feet
Solid periosteal reaction
Fluid-fluid levels on MR (presumably secondary ABC)
Surrounding oedema
Treat with curettage and packing. Difficult to completely resect so 20% recurrence
Differential: GCT (older), clear cell chondrosarc (older, larger, higher T2 - chondroblastoma solid portions are intermediate T2. The two share preference for epiphyseal location)

Question 2

Acromegaly

Answer 2

Calvarial thickening, frontal bossing, prognathism, enlarged sinuses
Thoracolumbar verteberal body fractures
OA - joint spaces may initially be enlarged
Spade-like enlarged terminal tufts
Spinal ligament hypertrophy - DISH appearance of posterior vertebral body scalloping
Dilated cardiomyopathy