[Ultrasonic diagnosis of fetal triploidy]

It can be assumed that among the most frequent pointers to triploidy are the sonographic proof of the existence of a voluminous and vacuolic placenta, early retardation of growth, and the presence of an oligohydramnios. Occasionally, other malformations are also observed, such as hydrocephalus or neural tube defects. Sonographic findings are demonstrated in two cases of triploidy found to exist before the 24 weeks of pregnancy in the living foetus. The clinical signs and patterns are discussed.