 Ovarian cancer is the commonest cause (46%) followed by colorectal carcinoma (31%), pancreatic cancer, stomach cancer and other malignancies including the hepatocellular carcinoma, gallbladder carcinoma, renal cell carcinoma, transitional cell carcinoma, endometrial, cervical cancers and unknown primary.Extra-abdominal conditions such as breast cancer, lung cancer and
malignant melanoma can involve the peritoneal cavity through the haematogenous spread.Many non-neoplastic and neoplastic conditions may mimic PC, such as tuberculosis, splenosis implant, peritoneal lymphomatosis, pseudomyxoma peritonei and primary peritoneal mesothelioma.