Adult presentation of congenital Bochdalek′s hernia is rare. Here we report the case of a 18-year-old boy who presented to us with dyspnea, low grade fever, and cough for whom the diagnosis of congenital Bochdalek′s hernia was confirmed by computed tomography (CT) scan of thorax after barium ingestion. Problems of this adult presentation because of difficulty in diagnosis, operative management, and rudimentary lung were properly and successfully dealt with in our case. We concluded that before undergoing operation in adult Bochdalek′s hernia, thorough check-up is necessary as rudimentary lung may not expand resulting in ventilatory insufficiency during postoperative phase.