Abstract
Postmortem studies of essential tremor (ET) have demonstrated the presence of degenerative changes in the cerebellum, and imaging studies have examined related structural changes in the brain. However, their results have not been completely consistent and the number of imaging studies has been limited. We aimed to study cerebellar involvement in ET using MRI segmental volumetric analysis. In addition, a unique feature of this study was that we stratified ET patients into subtypes based on the clinical presence of cerebellar signs and compared their MRI findings. Thirty-nine ET patients and 36 normal healthy controls, matched for age and sex, were enrolled. Cerebellar signs in ET patients were assessed using the clinical tremor rating scale and International Cooperative Ataxia Rating Scale. ET patients were divided into two groups: patients with cerebellar signs (cerebellar-ET) and those without (classic-ET). MRI volumetry was performed using CIVET pipeline software. Data on whole and segmented cerebellar volumes were analyzed using SPSS. While there was a trend for whole cerebellar volume to decrease from controls to classic-ET to cerebellar-ET, this trend was not significant. The volume of several contiguous segments of the cerebellar vermis was reduced in ET patients versus controls. Furthermore, these vermis volumes were reduced in the cerebellar-ET group versus the classic-ET group. The volume of several adjacent segments of the cerebellar vermis was reduced in ET. This effect was more evident in ET patients with clinical signs of cerebellar dysfunction. The presence of tissue atrophy suggests that ET might be a neurodegenerative disease.
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Acknowledgments
This work was supported by a Samsung Medical Center grant (SMO1131541) and by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST)(2011–0028333). Dr. Louis has received research support from the National Institutes of Health: NINDS #R01 NS042859 (principal investigator), NINDS #R01 NS39422 (principal investigator), NINDS #R01 NS086736 (principal investigator), NINDS #R01 NS073872 (principal investigator), NINDS #R01 NS085136 (principal investigator), NINDS #T32 NS07153-24 (principal investigator), NINDS #R21 NS077094 (co-Investigator), NINDS #R01 NS36630 (co-Investigator), NIEHS P30 ES09089 (co-investigator), and CTSA grant number UL1 RR024156. He has also received support from Parkinson’s Disease Foundation, the Arlene Bronstein Essential Tremor Research Fund (Columbia University), and the Claire O’Neil Essential Tremor Research Fund (Columbia University).
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Shin, H., Lee, DK., Lee, JM. et al. Atrophy of the Cerebellar Vermis in Essential Tremor: Segmental Volumetric MRI Analysis. Cerebellum 15, 174–181 (2016). https://doi.org/10.1007/s12311-015-0682-8
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DOI: https://doi.org/10.1007/s12311-015-0682-8