EFO_0009541 (disease of peritoneum) is a non-neoplastic or neoplastic disorder that affects the peritoneal cavity. Representative examples of non-neoplastic disorders include peritonitis and panniculitis. Representative examples of neoplastic disorders include adenomatoid tumor, primary peritoneal carcinoma, metastatic carcinoma to the peritoneum, and malignant mesothelioma. Also known as: disease or disorder of peritoneum, disorder of peritoneum, peritoneal disease, peritoneal disorder, peritoneum disease, peritoneum disease or disorder.