Abstract
We report a case in which bronchial atresia in an accessory lobe caused tension pneumothorax. The atretic bronchus was found in an accessory lobe (right S6) that had been incompletely isolated from the right lower lobe during the fetal period. The accessory lobe was overinflated, leading to bullous formation due to the trapping of air. Video-assisted excision of the posterior lobe was successfully performed without any perioperative complications. The pathological findings were compatible with congenital bronchial atresia. This is the first report of bronchial atresia in an accessory lobe. We must keep this lesson in mind because such cases can suddenly develop serious complications.
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