[Ultrasound findings as a sign of fetal triploidy].

A woman with severe pre-eclampsia refractory to treatment was examined in the 22nd week of pregnancy by ultrasound. This revealed a big renal cyst in the foetus and discrete signs of a partial hydatidiform mole. The pregnancy was terminated, chromosome analysis confirmed the presence of foetal triploidy, and the symptoms of severe pre-eclampsia disappeared immediately. This case illustrates that ultrasound can guide the obstetric management in the right direction, if the initial examination is performed early enough.