Appendicitis Caused by Endometriosis Within the Bowel Wall.

Acute appendicitis is one of the most common causes of acute abdominal pain seen in the emergency room. Common etiologies include obstructing appendicolith and lymphoid adenopathy. Appendiceal endometriosis is rare and typically involves the serosal layer. This case report describes an unusual case of appendicitis secondary to endometriosis in the musclularis mucosa of the appendix in the 36-year-old lady with no prior history of endometriosis.