Accessory superior acetabular notch

Last revised by Yahya Baba on 7 Dec 2020

An accessory superior acetabular notch is a normal variant of the acetabulum, which can be seen on radiographs. It may lead to diagnostic confusion, especially in younger patients. 

Radiographic features

  • appear as bilateral symmetric fluid-filled pits in the roof of the acetabulum with sharp margins

Differential diagnosis

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Cases and figures

  • Figure 1: notch vs. fossa
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  • Case 1: radiograph
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  • Case 1: CT
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  • Case 2: MRI
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