MedGen

A malignant neoplasm arising from the glandular epithelium of the appendix with invasion of the appendiceal wall beyond the muscularis mucosa. The majority of cases are well differentiated adenocarcinomas with mucinous stroma formation. Clinically, it may present as an abdominal mass or with symptoms of acute appendicitis. Patients with chronic ulcerative colitis are at a higher risk in developing appendiceal adenocarcinomas compared to the general population. [from NCI]

A type of ascites characterized by copious amounts of mucinous ascites and mucinous peritoneal implants, leading to progressive obliteration of the peritoneal cavity and intestinal obstruction. [from HPO]

An organ or organ-system abnormality that consists of uncontrolled autonomous cell-proliferation which can occur in any part of the body as a benign or malignant neoplasm (tumor). [from HPO]

A benign or malignant neoplasm involving the appendix. [from NCI]