Abstract
Both appendiceal diverticulum and appendiceal serrated adenoma are extremely rare. We report a case of appendiceal serrated adenoma with appendiceal diverticulum. A 73-year-old man was admitted to our hospital because of right lower abdominal pain. Abdominal enhanced CT revealed swelling of the appendix with fat tissue thickening, and with appendiceal diverticulum. We performed an appendectomy under the diagnosis of acute appendiceal diverticulitis. A moderate amount of pus-like fluid was observed around the appendix. The swollen appendix possessed three diverticula, one of which was perforated. Histological findings demonstrated that the diverticula were pseudo-diverticula and that a serrated adenoma existed at the base of the appendix. Appendiceal serrated adenoma with appendiceal diverticulum is extremely rare, and to the best of our knowledge, this case is the first to be reported in Japan.
