Pseudomyxoma peritonei is a rare diase in which peritoneal surface and omentum are diffusely involvId with gelatiinous mucinous implants and gelatinous ascites. This is commonly associated with the mucoceles of the appendix, ovarian cysts, or mucin secreting carcinomas of the gastrointestinal tract. The mucocele of the appendix is also a rare disease of which the incidence varied from 0.1 to 0.3% in every case of the appendectomy, and would appear to develope as a result of the onstruction in either appendix or large intestine.It seems that pseudomysoma peritonei is caused by the obstruction resulting from the mucin producing adenocarcinoma. the case of pseumomyxoma peritonel orginated from mucinous cystadenocarcinoma of the appendix is reported with a brief review of literature.