Question

the classic ct finding of bronchiectasis is: please select your answer... a \signet ring\ appearance - dilated bronchus adjacent to smaller pulmonary artery b \tree - in - bud\ nodularity c fibrosis in subpleural regions d consolidation

Explanation:

Bronchiectasis is a condition where the bronchi are dilated. The "signet ring" sign on CT is a classic finding. It occurs because a dilated bronchus (which should be similar in size to the adjacent pulmonary artery) is larger than the adjacent pulmonary artery. The "tree - in - bud" pattern is more associated with bronchiolitis (e.g., infectious bronchiolitis). Fibrosis in subpleural regions is a feature of interstitial lung diseases like usual interstitial pneumonia. Consolidation is seen in conditions like pneumonia where the alveoli are filled with fluid, cells, etc.

Answer:

A. "Signet ring" appearance – dilated bronchus adjacent to smaller pulmonary artery