Fig. 1From: A case of femoral arteriovenous fistula caused by central venous catheterization under inadequate ultrasound guidanceScheme illustration of the relationship between the needle and ultrasound image. The femoral artery and femoral vein did not overlap at the inguinal ligament level. However, both vessels overlapped toward the periphery. The figures below are ultrasound images at each point. A femoral artery, V femoral veinBack to article page