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Accessory superior acetabular notches

Case contributed by Dr Roberto Schubert

Presentation:

A boy with unexplained right hip pain was referred for suspected osteochondritis dissecans.

Patient Data:

Age: 15
Gender: Male
Race: Caucasian
Modality: MRI

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

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 do not infrequently lead to confusion, especially in younger patients.

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