Fluoroscopy is a direct examination in which the patient is placed between the X-ray tube and the fluoroscope. It can be used for direct observation of overall dynamics, such as cardiac pulsation, transverse septal activity, gastrointestinal motility, and joint activity. X-ray fluoroscopy is most commonly used in the chest to examine the lungs, pleura, mediastinum, heart, and large blood vessel lesions. It can also be used to examine the bones of the limbs, soft tissues, foreign bodies and gases in the body cavity, stones, contraceptive rings, etc. Physical examination reveals soft tissue fissures in the sternal region. Chest fluoroscopy, chest plain film, chest ultrasound, pleural effusion examination, chest CT examination. Chest plain film, also called chest radiography. The X-ray image obtained from chest fracture radiography is much clearer than that from fluoroscopy, and its advantages include: 1. The image of the examined area is permanently preserved on the film, which can be used for analysis, discussion and review for comparison. 2.It can be preserved as scientific research data. 3.Fluoroscopy can show the microstructure, such as 2mm or more of the early source of disease is clearer than fluoroscopy. 4.The radiographs can examine thicker parts of the body and make the patient receive less X-rays. In the embryonic period, the sternal plate is formed at the beginning of the sternum. At about the 9th to 10th week, both sternal plates fuse with each other in the midline to form the whole sternum. If this fusion is not completed during embryonic development or is only partial, a sternal cleft is formed. According to the location and extent of the cleft, it can be divided into upper sternal cleft, lower sternal cleft and total sternal cleft.