This fetus was scanned at 18 weeks and 1 day menstrual age. All the biometry was consistent with 17 weeks days. The patient had no rupture of the membranes.

The following images were obtained and all appear fairly unremarkable aside from the growth retardation, the placentomegaly and the severe oligohydramnios.

Normal heart

The abdomen, stomach ands kidneys

The limbs

The spine

Placenta and cervix

The findings were: 

• mild growth retardation, 
• placentomegaly and 
• severe oligohydramnios.

The kidneys were visible and aside from a small amount of pyelectasis were unremarkable (no cysts in particular). In particular the renal arteries were present. The bladder was also seen, and was not distended, which excluded some of the cystic renal disorders and the bladder outlet obstructions. Thus the oligohydramnios was not related to a renal problem. Since there was no history of TORCH infection, an aneuploidy was likely and since the fetus was fairly unremarkable, it was suggested that the source of this fetus problem was an aneuploidy or mosaicism of the placenta, and in particular trisomy 16. 

In view of the findings the patient was counseled, but she declined to not have a karyotype performed. The fetus spontaneously died at 35 weeks. The autopsy confirmed the diagnosis of Trisomy 16 limited to the placenta.