A case of "thalamic aphasia"
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概要
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The relationship between thalamic lesion and aphasia has been described by a few authors but the lesions dealt with in these reports are not strictly localized to the thalamus. Furthermore, the characteristics of the aphasia reported in relation to the thalamus have not been well documented. We present a case with well localized hemorrhagic lesion in the thalamus who manifested aphasia with neither motor nor sensory impairment.<BR>The case was a 54-year-old Japanese male. He had a history of dysarthria in April 1977, when CT revealed low densities in the right basal ganglia and the thalamus. The symptom disappeared within a month. On Jan. 22, 1978, when playing golf he suddenly became reticent but had no other symptoms. He was immediately admitted to a hospital and 3 days later was transferred to Keio University Hospital.<BR>On admission, the neurological examination revealed intact cranial nerves and no impairments of motor and sensory systems. He did not take initiative of conversation and spoke only in response to our questions. His speech had the characteristics of intermittent erroneous omission of words or sentences and had a tendency to accelerate with his voice trailed off into silence. Repetition was normal except omission of words. Object naming and auditory comprehension were normal. Written expression, reading comprehension, dictation and copying were also normal.<BR>Routine laboratory studies were normal. CT revealed a small high density area with circumscribed low density in the left thalamus. His speech did not change remarkably even after disappearance of high density area, although the small low density area remained in the thalamus.<BR>The characteristics of the aphasia caused by the thalamic lesion were summarized;<BR>1) paucity of spontaneous speech<BR>2) low voice, diminution of voice volume, feeble speech<BR>3) rapid fatigability, trailing off words<BR>4) respiratory inhibition, arrest of speech<BR>5) omission of words or sentences<BR>6) paraphasia, anomia, perseveration<BR>The aphasia with those characteristics may be placed into a new category of "thalamic aphasia".
- 一般社団法人 日本脳卒中学会の論文
一般社団法人 日本脳卒中学会 | 論文
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