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 5–20 mm in diameter 4 - Localized or diffuse large malignant masses (more than 2 cm in diameter)
Could you please explain what peritoneal carcinomatosis means?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: Could you please explain what peritoneal carcinomatosis means? [/INST] \n 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 5–20 mm in diameter 4 - Localized or diffuse large malignant masses (more than 2 cm in diameter)</s>