Directly, Although in any part of the body, but are more common in general upper limb, such as the forearm and hand fingers and parts of the extremities, arteriovenous knee, crus and foot and vein.
虽然在身体任何部位都可发生，但一般多见于肢体，如上肢前臂、手掌和手指部位的动静脉，下肢的膝部、小腿和足的动、静脉。
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