Presentation
Hip pain.
Patient Data











Focal 3mm deep 8mm wide fossa within the superior aspect of the acetabulum with cartilage continuing to line the fossa consistent with a supra-acetabular fossa (a normal variant). No evidence of any adjacent marrow reaction which you would certainly expect if this region represented an acquired osteochondral defect.

Coronal and sagittal PD weighted images of a supra-acetabular fossa. Note how the fossa remains lined with intermediate signal cartilage.
Case Discussion
Characteristic MRI appearance of a supra-acetabular fossa which is a normal variant. There is a small hip joint effusion which may indicate synovitis as a cause for the patient's symptoms.