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In clinical practice, cervical transforaminal epidural steroid injection (TFESI) is commonly used for alleviating pain. We report a case of segmental spinal myoclonus that developed after cervical transforaminal local anesthetic and steroid injection. A 39-year-old man presented involuntary movements of the bilateral upper trapezius muscles after cervical TFESI on the right C6 and C7 roots with a 5 mg dexamethasone injectate mixed with 0.5 mL of 1% lidocaine and 0.5 mL of normal saline at each level. His myoclonus was semi-rhythmic and co