Peritoneal Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A benign or malignant neoplasm that affects the peritoneum. Representative examples of benign neoplasms include adenomatoid tumor and disseminated peritoneal leiomyomatosis. Representative examples of malignant neoplasms include primary peritoneal carcinoma, metastatic carcinoma to the peritoneum, and malignant mesothelioma.