The preauricular sulcus.
The preauricular sulcus of the iliac bone has been described by some as a characteristic of the female pelvis. The author investigated this possibility in a review of the pelvic radiographs of 100 men and 200 women. The results indicate that the preauricular sulcus is indeed a female characteristic which may be observed in approximately 25% of women.
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007085:Ilium / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D008297:Male; D011859:Radiography; D012737:Sex Factors