Etiology: Funnel chest is a congenital thoracic deformity in which the lower part of the sternum and the adjacent rib cartilage are sunken backwards, resembling a funnel. Funnel chest is the most common congenital thoracic deformity with an incidence of 2 to 4 per 1,000. Its etiology is not well understood, and some patients have a family history, which is currently thought to be unrelated to calcium deficiency and may be a deformity formed by compensatory backward displacement of the sternum due to unbalanced development of the lower thoracic sternum, rib cartilage and ribs. Symptoms: A mild funnel chest can have no obvious symptoms, while a moderate degree of funnel chest or above can affect the normal development of heart and lungs because the sunken sternum squeezes important organs in the chest cavity, and young children often have repeated respiratory infections due to airway obstruction. As children grow older, the sunken sternum also affects cardiopulmonary function, resulting in decreased ventricular blood displacement and reduced lung capacity, which significantly reduces activity tolerance compared to normal children of the same age, and even presents symptoms such as dyspnea, palpitations, and even precordial pain after activity, and some children also have arrhythmias and systolic murmurs. Some children also have congenital heart disease, pulmonary hypoplasia, Marfan syndrome, asthma, etc. The appearance of the anterior thoracic deformity also causes great psychological stress to the child, which can easily lead to aloofness or psychological disorders. Diagnosis: Funnel chest is diagnosed clinically at a glance, but to determine the severity of funnel chest relies on chest CT examination. Chest CT can more clearly show the severity of thoracic deformity and the degree of heart compression and displacement. We use the Haller index to evaluate the severity of the funnel chest, which is the ratio of the maximum medial transverse diameter of the thorax measured in the most depressed plane of the sternum to the shortest distance between the posterior border of the sternum and the anterior border of the vertebrae in the corresponding plane. Surgery is required. Treatment: At present, the treatment of funnel chest can only be corrected by surgery. Our department adopts the most advanced international “minimally invasive funnel chest orthopedic surgery”, which involves making two to three small holes of 1 to 2 cm in the chest wall without cutting the sternum and ribs, and placing orthopedic plates behind the sunken sternum to lift the sternum. The operation is very traumatic, with minimal bleeding, very short time (about 30 minutes), quick recovery (can be discharged in 3 days), no incision in the anterior chest, very beautiful appearance, and minimally invasive surgery to remove the plate after 2 to 3 years. At present, our department treats more than 400 cases of patients with funnel chest by minimally invasive funnel chest orthopedic surgery, among which the youngest is 3 years old and the oldest is 39 years old, and the results are very satisfactory and rank the leading level in China, which is very popular among children with funnel chest and their parents. Indications for surgery: At present, the indications for minimally invasive funnel chest surgery include the following: (1) moderate or severe funnel chest with thoracic index >3.25; (2) progressive aggravation of thoracic deformity; (3) contradictory movement of chest wall during deep inspiration; (4) patients with obvious symptoms, such as palpitations, chest pain and decreased activity endurance; (5) chest wall appearance deformity that is unacceptable to patients and parents and affects the psychological development of children; (6) patients who have failed or recurred after conventional surgery. Patients with recurrence of funnel chest. Pre-operative CT thoracic index >6, orthopedic plate implantation, post-operative thoracic appearance