Which of the following is NOT responsible for pulmonary eosinophilia –
**Core Concept**
Pulmonary eosinophilia refers to an accumulation of eosinophils in the lungs, which can be caused by various conditions, including parasitic infections, allergic reactions, and malignancies. This phenomenon is often characterized by an increase in eosinophils in the lung tissue, leading to symptoms such as cough, shortness of breath, and chest tightness.
**Why the Correct Answer is Right**
Pulmonary eosinophilia can be caused by several factors, including:
* **Parasitic infections**: Such as Strongyloides stercoralis, Ascaris lumbricoides, and Toxocara canis, which can lead to a significant increase in eosinophils in the lungs.
* **Allergic reactions**: Allergic bronchopulmonary aspergillosis (ABPA) is a classic example of an allergic reaction that can cause pulmonary eosinophilia.
* **Malignancies**: Certain types of cancer, such as lymphoma and leukemia, can also lead to pulmonary eosinophilia.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because this option is a common cause of pulmonary eosinophilia.
**Option B:** Incorrect because this option is a classic example of an allergic reaction that can cause pulmonary eosinophilia.
**Option C:** Incorrect because this option is a type of malignancy that can lead to pulmonary eosinophilia.
**Clinical Pearl / High-Yield Fact**
Remember that pulmonary eosinophilia can be a manifestation of various underlying conditions, and a thorough diagnostic workup is essential to determine the underlying cause.
**Correct Answer:** D.