Chicken chest (pectus carinatum) is also known as pigeon chest. The sternum bulges forward deformity, like the chest of a chicken or pigeon, so called chicken chest, is the second common thoracic deformity of the anterior chest wall, less common than funnel chest, the incidence of about one in a thousand, the ratio of men to women is about 4:1, accounting for 16.7% of all chest wall deformities, the symptoms appear late, more than 50% after the age of 11 years. The etiology is not yet clear and may be related to heredity, with a family history of about 20%-25%. It is generally believed to be caused by overgrowth of ribs and rib cartilage. The deformity of the sternum is secondary to rib deformity and can also be secondary to intrathoracic disease. What are the manifestations of patients with pectus excavatum? 1.Symptoms: Most children with pectus excavatum are not easily detected after birth and during infancy because of their large and fat abdomen. With age, the abdominal muscles are usually strengthened and the abdominal size disappears at school age, and they are detected. Most children often have varying degrees of respiratory symptoms in early childhood and are in poorer physical condition than children of the same age. Some patients develop shortness of breath, weakness, and even affect cardiopulmonary function. 2.Signs: The chest wall anterior convexity deformity has various forms and different classifications. Some scholars divide the corpus cavernosum into three types: sternal bowed anterior convexity, asymmetric type and sternal stem anterior convexity. The most common type is the sternal bowed anterior convexity: the sternal body is bowed anteriorly, the rib cartilage on both sides is symmetrically collapsed backward and downward in a groove, and both rib edges are turned out. The second type is asymmetric: the sternum and the rib cartilage on both sides are unevenly convex, with one side higher and one side lower, often accompanied by rotation of the sternum to the higher side. The less common type is sternal stalk convexity: the sternal stalk is convex due to the deformed healing of the sternal body, and the lower part of the sternal body gradually sinks and its distal end reverses forward, forming a deformity of upper convexity and lower concavity. Once parents find that their child has a problem with chest development, they should seek medical attention in time for early diagnosis and early treatment to avoid adverse effects on the child’s future growth and development, parents can contact me if they have any questions.