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 examination. Withthe advent of CT scanning, CT is capable of direct imaging of peritoneal metastic lesions had reported occasionally, but rerely in Korea. So, authors illustrated the CT manifestation of peritoneal metastatic lesionsin 32 cases of macroscopically proven cases in laparoscopy of laparotomy in Korea University Hae Wha Hospital during recent 4 years. The results are as follows. 1. Of tatal 32 cases, 18 cases were male and 14 cases werefemale. Age incidence was the most common in 6th decade. 2. The most common type of malignancy that causeperitoneal metastasis was the stomach cancer and next common type of malignancies were pancreas cancer in men and ovarian cancer in women. 3. Of total 32 cases of peritoenal metastasis which was confirmed by laparoscopy or laparotomy macroscopically, 23 cases (72%) were detected peritoneal thicknening and/or omental pathology by CT, and the remaining 9 cases(28%) were not detected by CT. 4. Ascites was present in 19 cases(59%). 5. Parietal peritoneal thicknening was present in 16 cases (50%) by CT and sheetlike pattern was the most common findings. The patterns of peritoneal thickening was relatively nonspecific and was not correlated with primary tumor type. 6. Tumor involvement of greater omentum by CT was present in 19 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 nonspecific and was not correlated with primary tumor type.