After repeated infections manifested by cough, fever, and consolidation in lungs, the diagnosis of intralobar sequestration was established for a child. Sequestration of lung is seen MOST commonly in:
## **Core Concept**
Intralobar pulmonary sequestration is a rare congenital anomaly characterized by a portion of lung tissue that receives its blood supply from an anomalous systemic artery rather than the pulmonary arteries. This condition often presents with recurrent respiratory infections, including cough, fever, and consolidation.
## **Why the Correct Answer is Right**
The correct answer, **lower lobe of lung**, is the most common location for intralobar sequestrations. These anomalies usually occur in the lower lobes, particularly in the posterior basal segments. The blood supply to the sequestrated lung tissue typically comes from a systemic artery, which can lead to recurrent infections due to abnormal blood flow and possible impaired drainage.
## **Why Each Wrong Option is Incorrect**
- **Option A:** While sequestrations can theoretically occur in any part of the lung, the upper lobes are less commonly involved compared to the lower lobes.
- **Option B:** The middle lobe is not a typical location for sequestrations; they are more commonly found in the lower lobes.
- **Option C and D:** These options are vague and do not accurately represent the specific and common location of sequestrations.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that intralobar sequestrations usually present later in life with symptoms of recurrent infection, whereas extralobar sequestrations often present in infancy with symptoms of cardiac failure due to the large systemic arterial supply. Imaging studies, particularly CT angiography, are crucial for diagnosing pulmonary sequestrations by demonstrating the anomalous arterial supply.
## **Correct Answer:** . lower lobe of lung