Median nerve injury caused by brachial plexus block for carpal tunnel release surgery.

Carpal tunnel release is required to treat patients with severe carpal tunnel syndrome. The regional anesthesia of the upper limb by brachial plexus block (BPB) may be a good alternative to general anesthesia for carpal tunnel release surgery, because it results in less complications. However, the regional anesthesia still has various side effects, such as hematoma, infection, and peripheral neuropathy. We hereby report a rare case of median nerve injury caused by BPB for carpal tunnel release.