This is a case of a 67-year-old woman with a congenital arteriovenous fistula of the right upper extremity arising from the right subclavian artery. It was treated successfully with catheter-directed embolization techniques. In reviewing the literature, a high incidence of right-sided congenital arteriovenous malformations of the proximal upper extremity was identified. This high incidence may be related to the complexity of the embryologic development of the right subclavian artery.
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