Hello sir, it is a kind of epithelial tumor usually originates from appendix,here i have no idea whether you undergone appendectomy earlier.it is a very rare kind of tumor .As the tumor grows and occludes the lumen, mucus accumulates and the appendix ruptures. The peritoneum is then seeded with mucus-producing cells, which continue to proliferate and produce mucus. The progressive accumulation of copious amounts of mucinous fluid gradually fills the peritoneal cavity and then it leads to intestinal obstruction, which is fatal without treatment. there is two types of treatment, 1.best suggested one is aggressive type; it includes cytoreduction and intraperitoneal chemotherapy cytoreduction means removal of as much as cancerous growth . intraperitoneal chemotherapy means administration of heated intraperitoneal chemotherapy after surgery. the survival rate is 5 years in 70-80%. i hope this information is helpful.