Oligohydramnios causes fetal deformation and is well
recognised in fetal renal agenesis (Potter sequence). The
absence of urine production by the fetus results in severe
oligohydramnios, which in turn causes fetal deformation and
pulmonary hypoplasia. Oligohydramnios caused by chronic
leakage of liquor has a similar effect.
A normal fetus may be constrained by uterine
abnormalities, breech presentation or multiple pregnancy. The
prognosis is generally excellent, and the risk of recurrence is
low except in cases of structural uterine abnormality.
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