A pelvic digit (also known as pelvic rib) refers to the development of bone in the soft tissues of the pelvis or abdominal wall. It can have one or more pseudoarticulations, making it look like a finger.
The main differential considerations are heterotopic ossification and avulsion fracture.
Reference
Van Breuseghem I. The pelvic digit: a harmless "eleventh" finger. Br J Radiol. 2006 Sep;79(945):e106-7.
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