“…Alternatively, there are several literatures describing that conservative therapy utilizing antimicrobial agents, antacids, nil per oral, and parenteral nutrition was effective to cure perforated duodenal diverticulum 5, 6, 10. It should be noted that there has been reports of death, and therefore, surgical treatment in a timely manner is crucial 5, 11, 12. Given these facts, nonsurgical drainage from retroperitoneal abscess could be one of the options to treat with perforated diverticulum.…”