Which of the following would most likely be observed in the lung during an autopsy of a 2 week old infant who died of neonatal respiratory distress syndrome?
**Core Concept**
Neonatal respiratory distress syndrome (NRDS) is a condition that affects premature infants, characterized by difficulty breathing due to surfactant deficiency in the lungs. Surfactant is a **lipoprotein complex** that reduces surface tension in the alveoli, facilitating easier lung expansion during inhalation.
**Why the Correct Answer is Right**
The correct answer is related to the pathological changes seen in the lungs of infants with NRDS. In NRDS, the lack of surfactant leads to increased surface tension within the alveoli, causing them to collapse, which in turn leads to **atelectasis** and **hyaline membrane formation**. This results in characteristic gross and microscopic findings in the lungs.
**Why Each Wrong Option is Incorrect**
**Option A:** This option might relate to a different condition or finding not directly associated with NRDS.
**Option B:** Similarly, this might be a feature of another pulmonary condition.
**Option C:** This could be a finding in other types of respiratory distress but is not the hallmark of NRDS.
**Why Each Wrong Option is Incorrect** (continued)
**Option D:** While this might be seen in various lung conditions, it is not the most specific finding for NRDS.
**Clinical Pearl / High-Yield Fact**
A key finding in NRDS is the presence of **hyaline membranes**, which are eosinophilic, proteinaceous material lining the alveolar ducts and terminal bronchioles, a result of the exudation of fibrin and cellular debris.
**Correct Answer:** Correct Answer: D. Hyaline membrane disease.