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Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein in the leg or arm. There are two types of veins in the leg: superficial veins which lie just below the skin and can be seen on the surface, and deep veins which lie deep within the leg muscles.
DVT Slideshow Deep vein thrombosis (DVT) is a dangerous and sometimes fatal blood clot that occurs deep within the lower leg or thigh. Understand the symptoms, treatment and prevention of deep vein thrombosis (DVT). Edema Edema is the swelling of tissues as a result of excess water accumulation.