Low-grade mucinous neoplasia in a cecal diverticulum: A case report

•There are no previous reports of mucocele disease in a colonic diverticulum worldwide.•Laparoscopic ileocecal resection was chosen because of its minimal invasiveness and the patient had no evidence of recurrence 12 months postoperatively.•The possibility of a mucocele in a colonic diverticulum should be considered in patients with a colonic SMT.

IntroductionLow-grade mucinous neoplasia is an uncommon benign tumor that develops in the appendix. The development of mucocele disease has never been reported in a colonic diverticulum. We present a case developing low-grade mucinous neoplasia in a cecal diverticulum.Presentation of caseA tumor in the ileocecal region was found during a medical examination of a 66-year-old woman. Three months later, the tumor was still present and the patient developed abdominal pain. Laparoscopic ileocecal resection with D2 lymph node dissection was performed. Histopathological examination revealed a low-grade mucinous neoplasm in a cecal diverticulum.DiscussionColonic mucoceles reportedly originate from the appendix. There are no previous reports of mucocele disease in a colonic diverticulum worldwide. This report reviews and discusses the management of the appendiceal mucoceles.ConclusionThe incidence of colonic diverticula has recently begun to increase in Japan. The possibility of a mucocele within a colonic diverticulum should be considered in patients with submucosal colonic tumors.