A lesion of the anterior thalamus producing dystonic tremor of the hand.

BACKGROUND: Thalamic tremor is typically characterized by resting and intention components; a postural element is often present as well. Previously reported cases of acquired thalamic tremor have demonstrated lesions in the posterior thalamus or dentatorubrothalamic tract. OBJECTIVES: To report a case of dystonic-postural tremor of the upper extremity that occurred after a contralateral anterior thalamic infarct, and to discuss potential tremorigenic mechanisms. DESIGN: Case report. SETTING: Municipal hospital neurology clinic. PATIENT: A 65-year-old right-handed woman suddenly developed a dystonic tremor in her left hand after undergoing coronary bypass surgery. The tremor persisted unchanged for 8 months, at which time she was evaluated by us. Cranial magnetic resonance imaging scans demonstrated a right anterior thalamic infarct. CONCLUSION: To our knowledge, this is the first report of focal tremor caused by a lesion of the anterior thalamus.