自发性动脉夹层(artery dissection,AD)是指动脉壁层内的退行病变引起内膜撕裂,在血压的作用下导致血液成分通过破损的血管内膜进入血管壁,使血管壁分层,造成血管狭窄、闭塞或形成假性动脉瘤。当血肿聚积在内膜及中层之间 Spontaneous dissection of the arteries (AD) refers to the degenerative lesions in the arterial wall causing the intima to tear, causing the blood components to pass through the damaged intima of the blood vessel into the vessel wall under the action of blood pressure, stratifying the vessel wall Vascular stenosis, occlusion or the formation of pseudoaneurysm. When the hematoma accumulation in the intima and middle