Developmental sequence anomaly
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Schematic diagram of the pathogenesis of Potter sequence (oligohydramnios). Potter sequence is an example of a developmental sequence anomaly, in which a patttern of defects occurs due to a single anomaly or pathogenetic mechanism. The features of Potter complex develop secondary to oligohydramnios (severely reduced amount of amniotic fluid), irrespective of the cause of oligohydramnios.