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The results of clinical,radiologic,and electrophysiologic studies are retrospectively reviewed for 55 patients with neoplastic and 35 patients with radiation-induced brachial plexopathy.The presence or absence of pain as the presenting symptom,temporal profile of the illness,presence of a discrete mass on CT of the plexus,and presence of myokymic discharges on EMG contributed significantly to the prediction of the underlying cause of the brachial plexopathy.The distribution of weakness and the results of nerve conduction studies were of no help in distinguishing neoplastic from radiation-induced brachial plexopathy. |
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