<unk>  is a congenital birth defect. Specifically,<unk>  is a term used to describe the typical physical appearances of a fetus or neonate due to a dramatically decreased amniotic fluid volume oligohydramnios, or absent amniotic fluid anhydramnios, secondary to renal diseases such as bilateral renal agenesis (BRA). Other causes of<unk>  can be obstruction of the urinary tract, polycystic or multicystic kidney diseases, renal hypoplasia and rupture of the amniotic sac. The term<unk>  was initially intended to only refer to cases of BRA, however, it has been mistakenly used by many clinicians and researchers to refer to any case that presents with oligohydramnios or anhydramnios regardless of the source of the loss of amniotic fluid.
Potter syndrome
Oculo skeletal renal syndrome
Coffin-Lowry syndrome
Down syndrome
Grahmann's syndrome
Cohen syndrome
Heyde's syndrome
Medullary cystic kidney disease