A prospective analysis was conducted on 50 patients with biopsy-proven peritoneal carcinomatosis. Each patient underwent both CT and MRI examinations within a short interval. The MRI protocol was tailored to include standard sequences along with advanced imaging techniques—specifically DWI and T1 out-of-phase imaging. DWI was utilized for its sensitivity to changes in cellular density and tissue microstructure, while T1 out-of-phase imaging was implemented to improve the detection of lesions within fat-containing regions. Radiologists independently reviewed both imaging modalities for lesion detection, carefully noting the number, location, and any additional features such as invasion of adjacent structures. Cases where MRI provided additional or altered diagnostic information compared to CT were systematically recorded.