We experienced three cases of Enclodermal sinus tumor (EST) during 9 months of period developed at intestine ovary and sacrococcyx. EST is the most common Gerrn cell tumor in pediatric age. The sacror occygeal area is the major site of involvement in the newborn and infant; in older children, the ovary is the chief location. Like most Germ cell tumor, EST is very sensitive to Chemotherapy and thc long term survior have been reported recently with the regimen containing CDDP (cisplatinum).