Revision 2 for 'Preauricular groove'

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Preauricular groove

The preauricular groove or sulcus is a normal variant that is described to be characteristic of the bony female pelvis. It occurs at the insertion of the anterior sacroiliac ligament. 

Epidemiology

The preauricular groove is present in ~25% of women and ~5% of men 1.

Radiographic features

The preauricular groove is in the inferior ilium adjacent to the sacro-iliac joint, and can vary from slightly concavity to a deep groove with overhanging edges 1,2

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