A 22 year old G2 P1 presents with rupture of membranes at 19 weeks. She subsequently delivers. Which of the following is seen in autopsy of lungs of nonviable fetus
**Core Concept**
The question is testing the concept of pulmonary hypoplasia, which is a condition where the lungs fail to develop properly in a fetus. This can occur due to various factors, including premature rupture of membranes, where the fetus is exposed to amniotic fluid for an extended period, leading to lung compression and underdevelopment.
**Why the Correct Answer is Right**
In the case of premature rupture of membranes, the fetus is exposed to amniotic fluid for an extended period, leading to compression of the lungs. This compression prevents the lungs from expanding and developing properly, resulting in pulmonary hypoplasia. The lack of lung development is characterized by an underdeveloped bronchial tree, alveolar simplification, and a decrease in the number of alveoli. This makes it difficult for the fetus to breathe and exchange gases, leading to respiratory distress and, ultimately, death.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not directly related to the effects of premature rupture of membranes on fetal lung development. While oligohydramnios (decreased amniotic fluid) can also lead to pulmonary hypoplasia, it is not the most direct consequence of premature rupture of membranes.
* **Option B:** While meconium aspiration can cause respiratory distress in a newborn, it is not a direct consequence of pulmonary hypoplasia caused by premature rupture of membranes.
* **Option C:** This option is not directly related to the effects of premature rupture of membranes on fetal lung development. While hypoplastic lungs can be seen in other conditions, such as congenital diaphragmatic hernia, it is not the most direct consequence of premature rupture of membranes.
**Clinical Pearl / High-Yield Fact**
Pulmonary hypoplasia is a significant cause of neonatal mortality and morbidity. It is essential to identify the underlying cause of pulmonary hypoplasia, which can include premature rupture of membranes, oligohydramnios, congenital diaphragmatic hernia, and other conditions.
**Correct Answer:** C.