Fetal hydrocolpos leading to Pierre Robin sequence: an unreported effect of oligohydramnios sequence.

The presence of distal atretic vagina causing accumulation of fluid and mucus secretions in the proximal vaginal cavity resulted in fetal hydrocolpos. Obstructive uropathy developed gradually because of direct compression of hydrocolpos on bilateral lower ureters, resulting in oligohydramnios from decreased urine formation. Oligohydramnios inhibited normal mandibular development with resulting cleft palate and glossoptosis (Pierre Robin Sequence). The development of sequence of events in this case indicates Pierre Robin Sequence as another effect of Oligohydramnios Sequence arising out of deformational forces acting on cranio-facial structures.