Diagnosis of a fetal mesoblastic nephroma by 3D-ultrasound

We report a case of a fetal renal tumor detected prenatally on 3D-ultrasoun d. As the lesion was well encapsulated the initial sonographic diagnosis wa s that of a nephroblastoma. Volume calculation by the 3D technique gave a r eliable estimation of the tumor size. Contrary to all published case report s concerning antenatally diagnosed mesoblastic nephromas, there was no poly hydramnios. Elective delivery was performed by Cesarean section at 38+ week s gestation. The neonate underwent left nephrectomy on the second day of li fe. The subsequent course was uneventful without recurrence of the tumor.