Avascular necrosis and bone infarct - proximal femur
Pelvic pain for two years.
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Avascular necrosis on the right femoral head with a decreased signal intensity on T1W and T2W sequences, representing a stage D (fibrous-like).
There is also a geographic area of low signal intensity in the upper third portion of the right femur, surrounded by the serpinginous high signal rim. This is a characteristic appearance of a bone infarct.
High signal within the femur neck and the acetabular roof is present. Note the mild joint effusion in the right hip joint.
This patient was referred with a history of pelvic pain for two years ago after prescription of corticosteroids, which is the presumed cause.