Question: is gsv a deep vein?
Answer: The great saphenous vein (GSV, alternately "long saphenous vein"; /səˈfiːnəs/) is a large, subcutaneous, superficial vein of the leg. It is the longest vein in the body, running along the length of the lower limb, returning blood from the foot, leg and thigh to the deep femoral vein at the femoral triangle.