Unilateral pulmonary agenesis presenting in adulthood

Agenesis of lung,a rare congenital anomaly,may present in adult life with features of recurrent chest infections and radiologically may mimic many common conditions presenting as opaque hemithorax with ipsilateral shifting of mediastinum.Here, a case of a young man presenting with frequent attacks of cough expectoration and progressive dyspnoea since childhood,proved to be a case of left pulmonary agenesis on CT scan and bronchoscopy, is to be discussed.