Abstract
A 65-year-old man began to experience right lower abdominal pain off and on from April 2013, but ignored it initially. In October 2013, he visited our hospital because of aggravation of the right lower abdominal pain and passing brown-colored urine. The abdominal CT findings suggested the diagnosis of perforated appendicitis with abscess formation, and an emergency operation was performed. During the surgery, we did not find the abscess that was detected by preoperative imaging, but a fist-sized tumor in the pelvis contiguous with the cecum. Thus, ileocecal resection was performed. Histopathologically, the tumor was diagnosed as a low-grade appendiceal mucinous neoplasm. The cause of the mucocele of the appendix was non-infectious occlusion of the root of the appendix, which precluded the existence of emphysema in the mucocele. In this case, however, preoperative diagnosis was perforated appendicitis due to the emphysema in the mococele. Herein, we present a rare case of mucocele of the appendix with emphysema within the mucocele, together with a review of the literature.
