Idiopathic polyhydramnios

Source:  Idiopathic polyhydramnios    Tag:  silhouette sign radiology
In approximately 60% of cases of polyhydramnios, there are no abnormalities detectable in either the mother or the fetus.

Polyhydramnios. Sonogram of a fetus (F) with excessive amniotic fluid and a floating extremity (arrow). (P, placenta.)