Pulmonary vascular malformations are a relatively rare type of congenital vascular malformation, which can usually be categorized into three types: pulmonary arteriovenous malformations, pulmonary venous malformations, and pulmonary arteriovenous malformations. 1. Pulmonary arteriovenous malformation: the most common congenital malformation of the pulmonary circulation. It means that the blood vessels are dilated and tortuous or form cavernous hemangiomas, and the blood from the pulmonary artery does not pass through the alveoli, but flows directly into the pulmonary vein to form a right-to-left shunt. When the shunt is small, it is usually asymptomatic, but when the shunt is large, it may be manifested as severe cyanosis, pestle finger, decreased exercise tolerance, and exertional dyspnea. 2. Pulmonary venous vascular malformation: It is a disease of pulmonary venous vascular dysplasia. It may be manifested as shortness of breath, cyanosis, and frequent symptoms of lung infection. 3. Pulmonary arteriovenous malformation: it is caused by congenital arterial stenosis, pulmonary valve closure insufficiency, etc. It often manifests symptoms such as shortness of breath after exertion, fatigue, palpitation, coma and left heart failure. If the patient has the above symptoms, it is recommended to go to a professional hospital, after clarifying the cause of the disease, under the guidance of the doctor for further treatment.