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박형준,권기한,민양기,서범천,심동석,김승민,선우일남 대한신경과학회 2008 대한신경과학회지 Vol.26 No.1
Radiation-induced lower cranial neuropathy shows a clinical presentation similar to tumor recurrence or amyotrophic lateral sclerosis. We experienced two patients with bulbar palsies several years after radiotherapy for nasopharyngeal cancer. Brain magnetic resonance imaging showed no evidence of tumor recurrence. Electrophysiologic studies demonstrated mild denervation changes and myokymic discharges in muscles innervated by cranial nerves. Bulbar palsies progressed for 1 year then became stable. We emphasize the importance of myokymic discharges in the differential diagnosis of radiation-induced cranial neuropathy as radiation plexopathies.