Egg shell calcification is seen in – a) Bronchiolitisb) Silicosisc) Ca. bronchusd) Sarcoidosise) Histoplasmosis
**Core Concept**
Egg shell calcification refers to a specific pattern of calcification seen on radiological images, typically characterized by a thin, dense layer of calcium deposited around the periphery of a lesion or organ. This pattern is often associated with certain pathological conditions. **Pulmonary diseases** and **granulomatous conditions** are among those that can exhibit egg shell calcification.
**Why the Correct Answer is Right**
The correct answer, **Silicosis**, is a condition where egg shell calcification is commonly observed. Silicosis is an occupational lung disease caused by the inhalation of silica particles, leading to inflammation and scarring in the lungs. The calcification pattern in silicosis can appear as egg shell calcification around lymph nodes, particularly in the hilar region.
**Why Each Wrong Option is Incorrect**
**Option A:** Bronchiolitis is an inflammation of the small airways and does not typically exhibit egg shell calcification.
**Option C:** Ca. bronchus, or bronchogenic carcinoma, may show calcification but not typically in an egg shell pattern.
**Option D:** Sarcoidosis can exhibit calcification in lymph nodes but it's more commonly seen as a part of the disease's systemic involvement rather than specifically as egg shell calcification.
**Option E:** Histoplasmosis, a fungal infection, can cause calcification, especially in lymph nodes, but it's not characteristically described as egg shell calcification.
**Clinical Pearl / High-Yield Fact**
Egg shell calcification is a distinctive radiological finding that can help narrow down the differential diagnosis, particularly in cases of silicosis. Recognizing this pattern is crucial for clinicians as it can guide further diagnostic workup and management.
**Correct Answer:** Silicosis.