Surgical and radiologic anatomy : SRA
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Bilateral variations in the formation and branching of brachial plexus are extremely rare. Multiple bilateral variations in brachial plexus right from divisions to branching pattern were observed during the dissection in an adult male cadaver. Lateral and medial cord formation showed deviation from the usual pattern. ⋯ Anomalous origin of many other branches on both sides was encountered. It is extremely uncommon to find so many variations in one body and bilateral variations are still too rare. Understanding of such variations is clinically important for diagnosing unexplained clinical signs and symptoms as well as during nerve blocks and certain surgical procedures around the neck and proximal arm.