Saphenous valve incompetence
Subacute thrombosis of varicose vein.
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Reflux of flow in the saphenous femoral junction during valsalva.
Reflux of blood flow in the great saphenous vein during valsalva or after flow augemntation lasting more than 2 seconds is considered as a cause of the valve malfuntion and the main cause of varicosities.