RESUMEN
A sacrococcigeal tumor was detect at ultrasound maternal exam in 25TH week of pregnancy. The girl was born full term by natural way by the parents' choise. The newborn present a tumor with 12 cm diameter, situated in sacrococcigeal region, with a large base of implantation and with posteroinferior growth. This tumor produced a dislocation of the rectum and a perineal area. In the first day of baby's life, we perform the operation. We removed a large tumor (600 gr) with the coccys bone and we obtained a good repair of anatomy of the region, without postoperatory functional troubles. Postoperatory evolution was good. The newborn lived hospital healed in the 14th day. The histopatologic exam confirmed that the tumor was benign. Later evolution was good.
