Facial anesthesia dolorosa following retrogasserian rhizotomy was treated by stimulation of the contralateral thalamic sensory nucleus (posterior ventralis medialis) through stereotaxically placed, chronically implanted electrodes in five patients. In four patients, facial pain was masked by electrically induced paresthesia. One patient continued to experience her pain through the induced paresthesia. The mechanism of pain control in these cases can be postulated as suppression at the thalamic level of neuronal hyperactivity projected from the deafferented trigeminal system.
Hosobuchi Y, Adams JE, Rutkin B. Chronic Thalamic Stimulation for the Control of Facial Anesthesia Dolorosa. Arch Neurol. 1973;29(3):158–161. doi:10.1001/archneur.1973.00490270040005
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