MUC5AC and pseudomyxoma peritonei: On the other hand, Ronnett and associates classified pseudomyxoma peritonei into three categories: (1) disseminated peritoneal adenomucinosis (DPAM), where there is abundant mucin and scanty simple mucinous cells with little atypia and mitotic activity, (2) peritoneal mucinous carcinomatosis (PMCA), where the cellular and architectural features of carcinoma exist, and (3) peritoneal mucinous carcinomatosis with intermediate or discordant features (PMCA-I/D), where intermediate features exist [15].