Meckel's diverticulitis with associated enterloith formation: a rare presentation of an acute abdomen in an adult.

Meckel's diverticulum (MD) is the most common congenital anomaly of the gastrointestinal tract, occurring in 2-3% of the population. Enterolith formation associated with MD is a rare entity. We present the case of a 35-year-old active duty sailor who presented with a 24-hour history of worsening abdominal pain and nausea. His exam revealed lower abdominal peritonitis. An abdominal and pelvic CT scan revealed a fluid-filled structure in the pelvis adjacent to the distal small bowel with associated calcifications. Exploratory laparotomy was performed, which revealed an acutely inflamed MD associated with enterolith formation. Consideration of this condition in the differential upon presentation of an acute abdomen is essential, secondary to the morbidity that can accompany it when misdiagnosed.