While double contrast x-ray examination and endoscopy are highly accurate in evaluating intraluminal lesion ofstomach, they do not offer proper information regarding gastric wall and extragastric lesions. CT is very muchvaluable and vital in evaluating the above structures. Information obtained through CT is valuable in planning oftreatment, surgical resectability and prognosis. Author analysed 150 cases of gastric carcinoma diagnosed at thishospital through CT scan during period between January 1986 and October 1988. 50 cases received surgery. Thefollowing resuslts were obtained. 1. Among 50 cases who received surgery, CT staging according to modified Moss'sCT Classification, is accurate compared with surgery and pathology in 96 percent. 2. Adopting new criteria inevaluating perigastric lymphnode metastasis, 94%'s accuracy is obtained. 3. CT is poor in evaluating presence ofasites, lesions of mesentery, omentum. Peritoneoscopy is suitable for this purpose. Combined CT examination andperitoneoscopy will render almost complete and accurate evaluation of extragastric lesion resulting from gastriccarcinoma. 4. High quality CT machine, meticulous technic and high standard CT interpretation are vital inreaching accurate diagnosis.