A young man with pulmonary tuberculosis presents with massive recurrent hemoptysis. For angiographic treatment, which vascular structure should be evaluated first:
**Core Concept**
Pulmonary tuberculosis (TB) can lead to complications such as massive recurrent hemoptysis due to the erosion of blood vessels, particularly in the context of cavitation. The primary goal of angiographic treatment is to identify and embolize the bleeding vessel to control the hemorrhage.
**Why the Correct Answer is Right**
In pulmonary TB, the bleeding is often caused by the erosion of pulmonary arteries, particularly the segmental or subsegmental arteries. The pulmonary arteries branch off from the pulmonary trunk and further divide into segmental and subsegmental arteries, which supply blood to the lungs. The segmental and subsegmental arteries are more susceptible to erosion and subsequent bleeding due to their thin walls and proximity to the lung parenchyma. Angiography should focus on evaluating these smaller arteries to identify the source of bleeding.
**Why Each Wrong Option is Incorrect**
**Option A:** The pulmonary trunk is the main vessel that branches off from the right ventricle, but it is not the primary focus of angiographic evaluation in cases of hemoptysis due to pulmonary TB.
**Option B:** The bronchial arteries are a common source of bleeding in cases of hemoptysis, but they are not the primary focus in pulmonary TB-related bleeding. The bronchial arteries supply oxygenated blood to the bronchi, but they are not the primary vessels involved in pulmonary TB-related bleeding.
**Option C:** The aorta is the main artery that supplies blood to the entire body, but it is not the primary focus of angiographic evaluation in cases of hemoptysis due to pulmonary TB.
**Clinical Pearl / High-Yield Fact**
In cases of massive recurrent hemoptysis due to pulmonary TB, it is essential to perform angiography to identify and embolize the bleeding vessel promptly to prevent further complications.
**Correct Answer:** C. Pulmonary arteries