Peritoneal metastasis is frequent mode of dissemination of intraabdominal malignancies. Radiologic diagnosis of peritoneal metastasis has relied on indirect evidence on a barium UGI series and small bowel exammination. With the advent of CT scanning CT is capable of direct imaging of peritoneum. The sensitivity of CT in detecting peritoneal metastasis and CT manifestation of peritoneal metastatic lesions had reported occasionally but rarely in Korea. So authors illustrated the CT manifestation of peritoneal metastatic lesions in 32 cases of macroscopically proven cases in laparoscopy or laparotomy in Korea University Hae Wha Hospital during recent 4years The results are as follows: 1. Of total 32 cases 18 cases were male and 14 cases were female. Age incidence was the most common in 6the decade.2. The most common type of malignancy that cause peritoneal metastasis was the stomach cancer and next common type of malignancies were panceras cancer in men and ovarian cancer in women. 3. Of total 32 cases of peritoenal metastasis which was confirmed by laparoscopy or laparo-tomy macroscopically 23 cases (72%) were detected peritoneal thickening and/or omental pathology by CT and the remaining 9cases (28%) were not detected by CT. 4. Ascites was present in 19 cases(59%).5. Parietal peritoneal thickening was present in 16 cases (50%) by CT and sheetlike pattern was the most common findings. Thepatterns of peritoneal thickening was relatively nonsp-ecific and was not correlated with primary tumor type. 6. Tumor involvement of greater omentum by CT was present in 9 cases (59%) There were 7 cases of smudged appearance pattern 6 cases of nodular pattern 6 cases of omental cake pattern and no cystic mass pattern. The patterns of omental patholgy was relatively nonsp-ecific and was not correlated with primary tumor type.