“…The posterior approach may provide some advantages over lateral or anterior approaches to the brachial plexus. Potential adverse events associated with this technique include: Horner's syndrome, recurrent laryngeal nerve paralysis [12], unilateral phrenic nerve paralysis, subclavian artery injury [12], epidural placement [15], intrathecal injection of local anesthetic [16], and paralysis [16]. Although the patient had a BMI of 40 kg/ m 2 , we do not believe that it posed additional technical challenges or contributed to the catheter knotting.…”