Abstract
Benedikt’s syndrome (BS) is caused by the lesion in the midbrain and specifically manifests a series of symptoms, including ipsilateral third nerve palsy, contralateral tremor, hemiataxia, and hyperactive tendon reflexes. Deep brain stimulation (DBS) for BS emerges as a new approach and achieves successfully results. We report a successful case report of thalamic ventral intermediate (VIM) nucleus DBS for a patient with BS. During follow-up of 3 years, DBS successfully control the tremor and greatly improve his living and working quality. We consider that VIM DBS may have sustained benefit for refractory BS that mainly presents as tremor.
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The authors of this interesting case report should be congratulated for the good clinical results achieved with a relative simple approach to midbrain (rubral tremor) in the context of “Benedict Syndrome” secondary to an hemorrhagic event.
Midbrain tremors are relatively rare, generally secondary to vascular event (ischaemia, AVM, cavernoma, etc.) but can be associated with multiple sclerosis, trauma tumours, and etc.
This form of tremor is generally unilateral, irregular, with frequence of 2-5 Hz and medically refractory.
Interruption of the cerebellar outflow is thought to be the primary pathophysiological cause and this form of tremor has both a proximal and distal component.
Beside the standard VIM/DBS stimulation for midbrain tremors (approach described by the authors) few new targeting strategies have been described with satisfactory long-term tremor control.
In our unit (Walton Centre Liverpool, UK), we approach this type of complex tremor with dual targeting; Zi/posterior subthalamic area utilizing an 8-contact lead. This approach allows flexibility for frequency of stimulation and the possibility of dual stimulation field for better tremor control.
Other authors have targeted the dento-rubro-thalamic tract with DTI integrated within the planning platform or multiple leads with dual targets.
Imaging improvement as well neuromodulation hardware improvement will allow in the years to come better results and a more standardised approach to this form of complex tremor.
Jibril Osman Farah
Liverpool UK
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Cheng, G., Yang, Y., Wang, Y. et al. Deep brain stimulation of the thalamic ventral intermediate nucleus for Benedikt’s syndrome mainly present as tremor: a long-term case observation. Acta Neurochir 160, 1349–1353 (2018). https://doi.org/10.1007/s00701-018-3526-8
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DOI: https://doi.org/10.1007/s00701-018-3526-8