All are true regarding bronchial cyst, EXCEPTa) 50-70% are seen in lungb) Usually seen in mediastinumc) May be premalignantd) Commonly gets infected

**Bronchial Cyst**
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**Core Concept**
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A bronchial cyst, also known as a bronchogenic cyst, is a congenital anomaly that arises from the abnormal budding of the tracheobronchial tree during embryonic development. It is a type of congenital lung malformation that can occur in the lung parenchyma or in the mediastinum.

**Why the Correct Answer is Right**
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Bronchial cysts are typically found in the lung parenchyma, particularly in the lower lobes, with a reported incidence of 50-70% in this location. They can also be found in the mediastinum, but this is less common, often occurring in association with other congenital anomalies. Bronchial cysts are usually benign and may be premalignant, although this is rare. Infection is a possible complication of bronchial cysts, especially if they become obstructed or rupture.

**Why Each Wrong Option is Incorrect**
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* **Option A:** Incorrect, as bronchial cysts are most commonly found in the lung parenchyma, not in the lung itself. The term "lung" is too broad and does not accurately describe the location of these cysts.
* **Option B:** Incorrect, as while bronchial cysts can be found in the mediastinum, this is not the most common location, occurring in approximately 30-40% of cases.
* **Option C:** Correct, as bronchial cysts are generally benign and premalignant in rare cases.
* **Option D:** Incorrect, as bronchial cysts are not commonly infected, although this can occur if the cyst becomes obstructed or ruptures, leading to secondary infection.

**Clinical Pearl / High-Yield Fact**
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Bronchial cysts can be difficult to diagnose preoperatively, and imaging studies such as CT and MRI may be necessary to confirm the diagnosis. A high index of suspicion is necessary to avoid missing this diagnosis, especially in cases where the cyst is located in the mediastinum or is complicated by infection.

**Correct Answer:** C. Premalignant