Introduction: Neuromyotonia is a late and rare complication of radiation therapy, consisting of involuntary sustained muscle contractions with a delay in relaxation.
Observation: We report the case of a 68-year-old man who developed neuromyotonia of the masseter muscle 6 years after irradiation for tonsil carcinoma.
Conclusion: This observation underlines the importance of a correct diagnosis that can lead to an efficient treatment by carbamazepine.