<prompt> Answer this question truthfullyCould you please explain what peritoneal carcinomatosis means?  <response>: <reason> According to the Gilly classification, peritoneal carcinomatosis may be classified according to nodule size and intraperitoneal involvement localized or diffuse into 4 categories: 0 - No macroscopic disease 1 - Malignant granulations less than 5 mm in diameter localized in one part of the abdomen 2 - Malignant granulations less than 5 mm in diameter diffuse to the whole abdomen 3 - Localized or diffuse malignant granulations 520 mm in diameter 4 - Localized or diffuse large malignant masses more than 2 cm in diameter 