What common feature is observed in both Potter sequence and Pierre Robin sequence?

The common feature observed in both Potter sequence and Pierre Robin sequence is respiratory distress.

In Potter sequence, which is associated with oligohydramnios (reduced amniotic fluid), respiratory distress occurs due to underdeveloped lungs (pulmonary hypoplasia) as a result of the lack of sufficient amniotic fluid to facilitate normal lung development. The inadequate space for lung expansion due to the absence of sufficient amniotic fluid leads to significant respiratory complications after birth.

Similarly, in Pierre Robin sequence, the condition is characterized by a triad of symptoms, including micrognathia (small jaw), glossoptosis (downward displacement of the tongue), and cleft palate. These features can also result in airway obstruction and subsequently cause respiratory distress. The positioning of the tongue and jaw can obstruct breathing, particularly in newborns, leading to challenges in maintaining adequate respiratory function.

While other options like micrognathia, renal anomalies, and cleft palate may manifest in one condition or the other, the immediate concern and shared feature between both sequences lie in the respiratory difficulties encountered due to their respective anatomical and developmental characteristics.