[A rare case of sirenomelia. Possibility of prenatal ultrasonic and radiologic diagnosis].

A rare case of sirenomelia malformation in a fetus of 33 weeks is reported. Besides typical fusion of the lower extremities, important alterations of the urogenital system and large intestine are present. A review of the literature on the subject is presented. The usefulness of ultrasonography in the prenatal diagnosis of this malformation is then stressed.