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MR imaging findings of tremors associated with lesions in cerebellar outflow tracts: Report of two cases
Author(s) -
Nakamura Ryohji,
Kamakura Keiko,
Tadano Yutaka,
Hosoda Yoshito,
Nagata Naokazu,
Tsuchiya Kazuhiro,
Iwata Makoto,
Shibasaki Hiroshi
Publication year - 1993
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/mds.870080218
Subject(s) - lesion , dentate nucleus , cerebellum , deep cerebellar nuclei , medicine , brainstem , magnetic resonance imaging , cerebellar hemisphere , anatomy , neuroscience , forearm , thalamus , psychology , cerebellar cortex , pathology , radiology
Two cases with severe tremors were studied by means of electromyograms using surface electrodes and also by magnetic resonance (MR) imaging. The first case was associated with multiple sclerosis and demonstrated a severe postural cerebellar tremor and an alternate activation of antagonist muscles in the right arm. The second case, with hemorrhage in the brainstem, demonstrated a severe tremor at rest and mixed synchronous and alternating activation of antagonist muscles in the left forearm. MR imaging studies localized lesions possibly responsible for these tremors. In the first case a lesion was located in the superior cerebellar peduncle just under the decussation, and in the second case a lesion was found between the red nucleus and the thalamus, with possible involvement of both the cerebellothalmic and nigrostriatal pathways. The first case accords with the theory that a lesion located in the dentate nucleus and its projection can cause severe postural cerebellar tremor. The lesion demonstrated in the second case may be responsible for “cerebellar tremor at rest” or “static (resting) cerebellar tremor.”