Crescent sign (osteonecrosis)

Case contributed by Mohammad Taghi Niknejad
Diagnosis almost certain

Presentation

Left hip pain.

Patient Data

Age: 14 years
Gender: Male
x-ray
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Info

Subchondral lucency is seen at the left femoral head.

Case Discussion

Features are consistent with the crescent sign seen on conventional radiographs, which refers to a subchondral lucency seen most frequently on the anterolateral aspect of the proximal femoral head, which indicates avascular necrosis of the femoral head.

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