Preauricular groove

Last revised by Henry Knipe on 19 Nov 2024

The preauricular groove, also known as preauricular sulcus or paraglenoid sulcus, is a normal variant described as characteristic of the bony female pelvis. It is a notch that occurs at the insertion of the anterior sacroiliac ligament 3

Epidemiology

The preauricular groove is present in ~20% (range 14-25%) of women 1,3 and ~5% of men 1.

Radiographic features

The preauricular groove is in the inferior ilium adjacent to the sacroiliac joint and can vary from a slight concavity to a deep groove with overhanging edges 1-3

Cases and figures

  • Figure 1
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