The main scope of diseases treated by vascular surgery includes: lesions of the neck, chest, abdomen, iliopelvic cavity and extremities, that is, all vascular diseases of the whole body except intracranial cerebrovascular and cardiovascular. I. Arterial diseases 1. Arterial dilatation diseases: thoracic aortic aneurysm, abdominal main (iliac) artery aneurysm and aortic coarctation, etc.; 2. Arterial stenosis or occlusive diseases: peripheral atherosclerotic occlusive disease (such as carotid artery, vertebral artery, subclavian artery, iliac artery, upper and lower limb artery stenosis or occlusion), diabetic foot, superior mesenteric artery stenosis or occlusion, renal artery stenosis or occlusion, etc.; 3. Arterial inflammatory diseases. Multiple aortitis, thrombo-occlusive vasculitis; 4. Arterial compression diseases: duodenal stasis syndrome, N artery entrapment syndrome; 5. Arterial embolic diseases: peripheral artery embolism such as: carotid artery, vertebral artery, subclavian artery, superior mesenteric artery, renal artery, iliac artery, upper and lower limb artery embolism, arterial thrombosis; 2. Venous diseases 1. varicose veins, lower limb traffic branch venous reflux, lower limb deep vein valve closure insufficiency; 2, venous obstructive diseases: thrombotic superficial phlebitis, upper and lower vena cava thrombosis, Bou-ga syndrome, lower limb deep vein thrombosis (caused by pulmonary embolism), portal vein, superior mesenteric vein thrombosis, renal vein thrombosis, etc. Third, arteriovenous diseases and some other vascular diseases Injury or invasion of peripheral arteries and veins: injury or malignant tumor invasion of peripheral arteries and veins in various parts. Arteriovenous fistulas (autologous or artificial vessels) established for hemodialysis; hemangiomas: capillary hemangioma, cavernous hemangioma, vascular smooth muscle sarcoma; congenital arteriovenous fistulas, acquired arteriovenous fistulas; congenital arteriovenous malformations, K-T syndrome; lymphatic vascular diseases: lymphedema, lymphangitis, congenital lymphatic malformations.