Abstract
A 2 month-old male infant with dyspnea was admitted to our department. CT and MRI showed a mediastinal cystic mass compressed the left main bronchus, and caused left lung emphysema. Someday dyspnea deteriorated suddenly, and chest X-ray film revealed right lung emphysema and atelectasis of left lung. This episode returned to the former condition 5 dyas later. Operation revealed a gourd-shaped paratracheal cyst constricted by azygos vein. This cyst attached to the trachea by a bronchus-like tissue involving cartilage, but no luminal connection. The cyst was multicystic and contained colorless mucinous fluid. The cyst wall was composed of ciliated cylindrical epitheliums, cartilages, smooth muscles and bronchial glands. Histological diagnosis was mediastinal bronchogenic cyst. Infantile mediastinal bronchogenic cyst often causes dyspnea because of airway weakness. In this case, it was peculiar that the side of emphysematous lung changed by minimal motive preoperatively.
