[Malignant sacrococcygeal teratoma: report of a case of "explosive" intrauterine growth].

: An exceptional case of fetal sacrococcygeal teratoma with an exclusive abdominopelvic growth is described. The tumor was not detected on a "routine" ultrasound study obtained at 31 weeks of gestation showing findings of a severe congenital uropathy. It remained unrecognized until the 34 weeks of gestation when the mass began an explosive growth causing a rectouretral fistula. Despite appropriate obstetrical and surgical management the baby died 24 hours later because inadequate pulmonary maturity. The istological findings showing malignant elements such as embryonal carcinomas.