Accessory nerve is one of the most sensitive cranial nerves to injury, and its injuries are usually caused by iatrogenic interventions. As many other causes can mimic its clinical presentation, careful physical examination should be performed while evaluating a patient suspected of accessory neuropathy. In this report, we aimed to illustrate a very rare case with concurrent traumatic cranial neuropathies of accessory nerve, suprascapular nerve, and long thoracicus. A 16-year-old boy was admitted with complaints of shoulder weakness and pain following a trauma of strain injury. He had first taken the misdiagnosis of brachial plexopathy; however, after a detailed physical examination and electrophysiological study, the diagnosis of concurrent traumatic neuropathies of accessory, suprascapular, and long thoracicus nerves was made. In our opinion, during evaluation of these rare traumatic neuropathies, detailed clinical evaluations combined with detailed electromyography investigations may give crucial data for the proper diagnosis.