Autoamputation of the Appendix Presenting as a Calcified Abdominal Mass Following Necrotizing Enterocolitis.

Autoamputation of the appendix has previously been reported in the literature, but it is likely an unusual event. We report a 2-year-old male child who had previously undergone laparotomy and bowel resection for necrotizing enterocolitis. Two years later a calcified intra-abdominal mass was identified on abdominal radiography and ultrasonography. Eventual laparotomy revealed a densely calcified mass within the transverse mesocolon. The mass was uneventfully resected. Pathologic evaluation showed appendiceal tissue, consistent with prior autoamputation of the vermiform appendix. Autoamputation of the appendix has not to our knowledge previously been associated with a calcified mass nor been associated with a history of necrotizing enterocolitis, and these factors distinguish this case as noteworthy.