Primary peritoneal mucinous adenocarcinoma in a man

A 69-year-old man suffered from lethal peritoneal carcinomatosis. At autopsy, no primary lesion was identified in the gastrointestinal, pancreatobiliary, respiratory, urinary and male reproductive organs. The tumor consisted of mucin-containing and gland-forming columnar cells with minimal nuclear atypia. The final diagnosis was primary peritoneal mucinous adenocarcinoma in a man.