Bronchogenic cysts are rare congenital lesions of the bronchial tree which are mostly asymptomatic. Rarely when the size is large it can compress on the adjacent structures in the mediastinum. We report a rare case of 10 month old baby presented with recurrent lower respiratory tract infection, was suspected to have a pericardial cyst on echocardiography. On further imaging it was confirmed to be a large bronchogenic cyst from the carina compressing on the left atrium and the left bronchus causing congenital lobar emphysema of the left lung. In view of compression of the adjacent structures patient was sent for surgery. Though congenital bronchogenic cysts involving pericardium and intracardiac tissues have been reported but mediastinal bronchogenic cysts compressing on left bronchus causing congenital lobar emphysema have rarely been reported.
Key words: Bronchogenic cyst, Congenital lobar emphysema.