Extraperitoneal presentation of pseudomyxoma peritonei as retroperitoneal invasion with skin fistula-a case report.

Pseudomyxoma peritonei (PMP) is characterized by mucinous ascites and implants throughout the peritoneal cavity. The tumor rarely involves retroperitoneum. We present a patient of PMP with retroperitoneal presentation and spontaneous development of a skin fistula. There had been only 7 such cases reported.