Accessory superior acetabular notches
A boy with unexplained right hip pain was referred for suspected osteochondritis dissecans.
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Bilateral symmetric fluid-filled pits in the roof of the acetabulum with sharp margins. Conspicuous sickle-shape of these pits on transverse images.
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.
- Johnstone WH, Keats TE, Lee ME. The anatomic basis for the superior acetabular roof notch "superior acetabular notch". Skeletal Radiol. 1982;8 (1): 25-7. - Pubmed citation