[Bronchial atresia and bronchogenic cyst in an adult].

We present the case of an asymptomatic patient, with a right paracardiac mass discovered in a preoperative radiologic study. The bronchoscopy showed the intermedius bronchus atresia, finished in bottom of sack, with absence of middle and lower right lobes. With the chest computed tomographic scan, two lobulated contour mediastinal masses were seen. The patient was submitted to surgery, being the pathological findings consistent with bronchogenic cysts with atresia of the intermediarius bronchus. The patient evolved favourably after surgery.