CT scan is presently the method of choice in the pre-operative evaluation of patients with peritoneal carcinomatosis. The aim of this article is to present the results of a personal work concerning the comparison of CT scan and the surgical data in the diagnosis of peritoneal carcinomatosis and to compare them with data of the literature. Despite the existence of unavoidable bias related to the retrospective characteristic of the study, the results confirm the good sensitivity of the scan in the examination of peritoneal carcinomatosis, through it remains insufficient to do without surgical exploration.