Accessory superior acetabular notch

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

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

Differential diagnosis

Lower limb anatomy
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Article information

rID: 22574
Section: Anatomy
Synonyms or Alternate Spellings:

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Cases and figures

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    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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