Abstract
A 78-year-old male with a large mass in the right abdomen was admitted to our hospital. Barium enema revealed the mass compressing the cecum upwards. A CT-scan disclosed a cystic mass with an irregular wall in the right retroperitoneal cavity. Under the clinical diagnosis of retroperitoneal tumor, an operation was performed. The mass in the retroperitoneal cavity contained brown-colored, jelly-like fluid and was merged with the cecum. Cytology of both the fluid and the surgical specimen of the cecum disclosed adenocarcinoma. The final diagnosis was appendiceal cancer. There have been no reports of appendiceal cancer rupturing into retroperitoneal cavity.
