According to the Center for Maternal Fetal Medicine, about 65 percent of cases of polyhydramnios result from unknown causes. (pregnancy-info.net)
If the measurement of amniotic fluid in the uterus is low, the condition is called olioghydramnios, and if it is high, it is called polyhydramnios. (pregnancy-info.net)
The risks associated with polyhydramnios include premature rupture of the membranes (PROM), placental abruption, and growth restriction (IUGR) which results in skeletal malformations. (pregnancy-info.net)