Accessory superior acetabular notches

Case contributed by Dr Roberto Schubert

Presentation

Unexplained right hip pain was referred for suspected osteochondritis dissecans.

Patient Data

Age: 15 years
Gender: Male

Bilateral symmetric fluid-filled pits in the roof of the acetabulum with sharp margins. Conspicuous sickle-shape of these pits on transverse images.

No evidence of osteochondritis dissecans.

Case Discussion

Features consistent of accessory superior acetabular notches.

These notches are normal variants of the acetabulum, that can also be seen on radiographs and not infrequently lead to confusion, especially in radiographic studies of younger patients.

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