What is peritoneal cancer? Cancer that has spread to the lining surfaces of the peritoneal (abdominal) cavity from ovarian cancer, primary colorectal cancer, appendiceal cancer, or mesothelioma and pseudomyxoma peritonei—known as peritoneal carcinomatosis—are cancers that are frequently referred to as peritoneal cancers. Whether peritoneal cancer starts in the peritoneum or spreads from somewhere else (colon, appendix, ovary), it is considered advanced (stage IV) once it’s in the peritoneum and might be referred to as peritoneal... read full review »