PROBLEM
A 50-year-old man complains of pain in his left hip. What is your impression of this film of his pelvis?

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ANSWER
The correct diagnosis is aseptic necrosis of the left femoral head. Note its spotty area of radiolucency and the increased density of its superior portion as compared with the right femoral head.

This series of diagnostic quizzes that challenge your ability to read a variety of x-ray films is edited by Dr. Keats, alumni professor of radiology at the University of Virginia School of Medicine in Charlottesville. Emerg Med 39(7):59-60, 2007