The spectrum of types of cancer in childhood differs strikingly from that in adults. Leukemia, central nervoussystem tumors, embryonal tumors, and sarcomas are much more common in children that are adenocarcinoma andcarcinomas, which constitute the majority of cancers in adults. In children under 15 years of age, intraabdominaltumors are the third most common one, preceded only by leukemia and brain tumors, It is well recognized that thesetumors remain silent until they assume huge size, and early detection and treatment are important. X-rayexamination is the most important method among diagnostic approaches. 150 cases of intraabdominal masses werereviewed in respect of age, sec, incidence, site of origin and radiographic findings. The resuls are summerized asfollows; 1. The most common site was retroperitoneum(80 cases: 53.3%), followed by intraperitoneum(47 cases:31.3%), and pelvic cavity(23 cases: 15.4%). The kidney was the single most common site of origin(33%). 2.Hydronephrosis was most common(23 cases; 15.3%) and Wilm's tumor(22 cases: 14.7%), teratoma(21 cases:14.0%) andneuroblastoma(18 cases: 12.0%) were descending order of frequency. One renal cell carcinoma in 9 year old femalepatient and bilateral duplications of pelvis with ureteroceles in 5 month old twin infants were found. 3. Maleoutnumbered femal in most childhood abdominal diseases, however female was predominant in teratoma(1:20) andcholedochal cyst(3:7). 97 cases were under the age of 5 years. 4. Radiographic findings were as follow. a. Simpleabdomen: In retroperitoneal tumors, mass shadows were the most common finding(89.7%) and obliteration of psoasshadows was noted in 73%. Calcifications were seen in 6 cases (100%) of teratoma as bone, teeth or amorphous, 1case(4.5%) of Wilms' tumor as amophous, and 5 cases (33%) or neuroblastoma as amorphous or psammomatous. Fatshadow was seen in 5 cases (83%) of teratoma. In intraperitoneal tumors, mass was the most common finding(69%). Inpelvic cavity tumors, calcification was noted in 6 cases (45%) and fat shadow in 3 cases (23%) of teratoma. b. IVPHydronephrosis showed pyelocaliectasis in 18 cases (80%) and nonvisualization in 5 cases(20%). In Wilms's tumor,nonvisualization was noted in 13 cases (60%), displacement and stretching in 7 cases (32%), and distortion andamputation of calices in 3 cases (14%). In neuroblastoma, displacement of kidney was note din 10 ase (70%),nonvisualization in 3 cases (14%), and displacement and stretching of calices in 1 case (7%). Teratoma showeddisplacement of kidney in 3 cases (75%). c. With liver scan, all of hepatoblastoma showed cold area. 5. Metastasiswas noted in 13 cases (77%) of neuroblastoma to bone, brain, liver and kidney, and in 7 cases (32%) of Wilm'stumor to lung and liver. 6. IVP was the single most important diagostic procedure and should be performed first inintraabdominal mass. Recently, CT scanning and ultrasonography are used for further diagnostic approach inintraabdominal tumor.