The surgical results of 37 patients with pseudomyxoma pertonei are reported. Twenty eight patients received laparotomy and complete cytoreduction (CC-0) could be done in 6 patients. However, 13 patients received incomplete cytoreduction, and 9 patients underwent drainage of ascites and peritoneal washing. The Peritoneal Carcinomatosis Index (PCI) was less than 20 in CC-0 patients. CC-0 patients survived significantly better than patients with residual disease. Accordingly, peritoneal washing to remove free cancer cells should be aimed for complete cytoreduction of the solid mucinous nodules.