Chest X-ray is one of the most common cardiothoracic surgery and respiratory medicine examinations, and is also one of the items that are often examined during clinical physical examinations. Chest X-ray can examine the size of the heart shadow, the morphology of the heart, the aorta and pulmonary artery of the heart, the presence of inflammation, pulmonary atelectasis and pulmonary solidity in the lungs, as well as the presence of pneumothorax and pleural effusion in the pleural cavity. In addition, the chest X-ray can also examine the mediastinum to find out whether there is any mediastinal deviation and whether there is any change in the size of the mediastinal shadow, etc. When visiting the chest for examination, you should visit the departments of respiratory medicine, thoracic surgery and cardiac surgery depending on the accompanying conditions. The specialist will prescribe various necessary tests including x-rays depending on the condition.