Capillary hemangioma of the right main bronchus treated by sleeve resection in infancy. Respiratory distress developed in a 5-month-old female infant with roentgenographic evidence of hyperinflation of the right lung. Bronchoscopy revealed a vascular tumor extending from the medial wall of the right main bronchus leading to a check-valve mechanism. Radionuclide lung scans showed ventilation and perfusion of the right side reduced to 36 and 11% of the total lung ventilation and perfusion, respectively. At the age of 7 months a sleeve of the right main bronchus was resected and a reanastomosis performed. The operation specimen contained a capillary hemangioma measuring 1.2 X 0.6 cm. The postoperative course was uneventful. Perfusion of the right lung had markedly improved 6 months after the operation, and at the age of 2 yr and 9 months it was completely normal. Capillary hemangiomas must be considered a cause of bronchial obstruction in infancy, and surgery can be performed successfully. 