Appendiceal mucinous cystadenoma presenting as abdominal internal hernia: a case report.

Appendiceal mucinous neoplasm is a rare form of appendix disorder of all appendectomies. Patients may present with many non-special symptoms which the right low quadrant pain is the mostly reported. We reported a case of 70-year-old man who was admitted to emergency for abdominal pain and progressive aggravation of peritoneal irritation sign. Computed tomography (CT) revealed incomplete intestinal obstruction with volvulus of partial small intestine in right lower quadrant, and internal hernia was suspected and simple appendectomy was performed followed. The postoperative pathologic diagnosis was mucinous cystadenoma with negative cutting margin. During three-year follow-up, the patient was in good condition and there was no sign of recurrence.