Abstract
Carotid stenosis after radiotherapy has been recognized as a complication of external irradiation to the head and neck resulting from treatment for cancer. However, myoclonus is seldom found. We report on a 33-year-old man diagnosed with nasopharyngeal cancer (NPC) cT1N1M0. He had undergone concurrent chemo-radiotherapy (CCRT) with Cetuximab (Erbitux) and curative radiotherapy (RT) with a dose of 7000cGy in 33 fractions. He developed a myoclonic jerk in the left neck 2.5 years after CCRT. Magnetic resonance angiography (MRA) revealed roughly 60% stenosis of the left proximal internal carotid artery. He did not receive any invasive intervention for carotid stenosis and the neck myoclonus was well controlled by an annual local Botox injection for 3 years.
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