The abdominal tumors in children are different from those of adults in respect to age brachets, basic tumortypes, sites of origin and clinical manifestations. In children carcinomas are exceedingly uncommon. Most of thetumors are embryonal in origin and teratoma make up the bulk of the remaining neoplasms. Abdominal tumors areusually silent until they have assumed tremendous size. Early detection and aggressive philosophy of managementbecame important as the trend to cure with radiation and chemotherapy increased. In a child with an abdominal massx-ray exams are useful and often diagnostic. The 92 cases of abdominal masses in infants and children under theage of 16, who had been treated at Severance Hospital for the duration of 14 years from 1960 to 1973 were reviewedin respect to their basic type of tumors, site of origin, age incidence as well as radiographic findings. Theresults may be briefly summarized as follows : 1. The commonest tumor was ovarian cyst being 25 cases which werelargely encountered over the age of 12. The next common tumors were Wilms' tumor, 17 cases, hepatoma, 9 cases,neuroblastoma and hydronephrosis, 8 cases each, teratoma 6 cases, etc. 2. The retroperitoneal space includingkidneys were the most commonly involved site (43.5%), of which Wilms' tumor was the commonest. 3. About 2/3 oftumors developed under the age of 6 and the commonest lesion was Wilms' tumor and the next being neuroblastoma,teratoma, ovarian cyst and so forth. 4. In all tumors except ovarian tumor and choledochal cyst, male was morefrequently affected. 5. In plain abdomen 75% of neuroblastoma crossed the mid line while in Wilms' tumor only 2cases (14%) showed midline cross. Calcific density was ent in all 6 cases of teratoma(100%) as dense and discreteossification, in 3 cases of neuroblastoma(38%) characteristically in diffuse stippled appearance and in one caseof Wilm's tumor(6%) in which calcification was nonspecific. 6. Intravenous pyelogram was the most significant anduseful study in the evaluation of abdominal tumors in children and in most cases it is the first x-ray examinationto be done except plain