Retention mucocele of appendix due to endometriosis

Retention mucocele of the appendix is caused by a variety of obstructive lesions such as postinflammation, fecalith, carcinoid tumor, and endometriosis. Appendiceal mucocele due to endometriosis is extremely rare; only one documented case of such condition has been recorded in the literature. We describe a young black woman who had abdominal pain, nausea, and vomiting. Abdominal exploration revealed a small retention mucocele caused by endometriotic obstruction at the distal segment of the appendix. No evidence of endometriosis in other organs was found. The patient was asymptomatic after appendectomy.