Case Report: Presentation of an unusual cause of carpal tunnel syndrome with accompanying literature review

Background: Carpal tunnel syndrome (CTS) is a condition seen commonly in clinical practice; high-flow arteriovenous malformations (AVM) can be a rare but important cause. Case Report:  We discuss a case of a patient who had developed left CTS in the fifth decade of life as the result of a progressively enlarging congenital peripheral AVM affecting his left upper limb. This case illustrates the clinical challenges encountered in the surgical and interventional management of this complex issue. Discussion: High-flow AVMs affecting the extremities may be comprised of a convoluted network of vessels in high-flow, low-resistance systems that often recur despite intervention. Conclusion:   Peripheral AVM affecting the hand can be a rare and therapeutically challenging cause of carpal tunnel syndrome that warrants multidisciplinary team discussion.