Lateral marginal vein
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The lateral marginal vein (also known as the vein of Servelle or the Klippel-Trenaunay vein) is located on the dorsal surface of the foot and is the principle tributary forming the small saphenous vein.
As an embryonic vein it usually undergoes regression before birth. It is part of the superficial venous system of the lower limb. Failure of obliteration leads to truncal vascular malformation. A lack of valves leads to presentation with chronic venous insufficiency 2.
It is seen in a portion of patients suffering from Klippel-Trenaunay syndrome.