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Hip pain in a 45-year-old woman.

A 45-year-old woman had gradually increasing discomfort in the left hip for several months. Two days before admission, while fleeing a swarm of bees, she fell and landed on her left hip, experiencing increasing pain with difficulty walking. The patient denied any history of fevers, chills, or weight loss. Through physical examination, slight tenderness to compression over the greater trochanter of the left hip was seen. Range of motion of the left hip was full with discomfort at the extremes. Neurologic examination was ordinary. Plain radiographs and magnetic resonance (MR) images were obtained and are shown below (Figs 1-4). Based on the history, physical findings, radiographic, and MR images, what is the differential diagnosis? Fig 2. TI weighted coronal MR image (2500/11)