Thank you for your query Pectus Excavatum (sunken chest) varies in degree (mild to severe). This is a defect in the development of the anterior ribs and sternum (breastbone). The heart and lungs are adjacent structures and depending on the degree of the defect, they may or may not be significantly compromised. Reduced lung capacity, Cardiac wall and valve defects can be diagnosed by appropraite tests. Initially , the severity of the defect must be assessed. A series of tests ( ECG, CT scan of the chest , Echocardiogram will show mechanical/conductive defects of the heart; pulmonary function tests, treadmill test(stress/exercise test ) will show the functional defects of the lung/heart.) Based on these, his age and overall health, a treatment plan will be made. If it is mild and without any compromise in lung and heart function, the concern is mainly of a cosmetic one. normal physical activity can be continued. Corrective surgery is optional If it is causing severe retardation in his overall endurance, a corrective surgery may help. There are different types of procedures all of which are associated with certain risks. This should be discussed with his doctor before making a decision and if the benefits outweigh the risks, the surgery carried out has excellent prognosis once he is on the road to recovery. Hope this helps. Please contact us if you have further questions. Wish you both good health