A non-atherosclerotic, inflammatory thrombotic disease that commonly involves small and medium-sized arteries or veins in the extremities. It is characterized by occlusive THROMBOSIS and FIBROSIS in the vascular wall leading to digital and limb ISCHEMIA and ulcerations. Thromboangiitis obliterans is highly associated with tobacco smoking.

A rare inflammatory non-necrotizing vascular disease affecting the small- and medium-sized arteries and veins of the upper and lower extremities characterized by endarteritis and vaso-occlusion due to occlusive thrombus development. The development and progression of the disease is consistently associated with exposure to tobacco.