Conclusion
Our patient with funnel chest successfully underwent safe re-sternotomy and CABG after omental flap for mediastinitis. The omentum functioned as a cushioning material between the sternum and mediastinal organs. An ultrasonic scalpel was useful for dissecting between the omentum and mediastinal organs. Omental flap provides cushioning between the sternum and mediastinal organs. We recommend an ultrasonic scalpel for dissecting between the omentum and mediastinal organs.