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Amnesia, Confabulation and Nonaphasic Misnaming after Left Thalamic InfarctContrast Enhanced Fast Fluid-Attenuated Inversion-recovery MR Imaging for Diagnosing Cerebral Venous Angioma :: Report of Two Cases Ryuichiro Hayashi 1 , Masashi Ohashi 2 , Ryo Watanabe 3 , Masaru Mimura 4 , Yasushi Katsumata 5 1Department of Neurology, Yokohama City Hospital 2Department of Psychiatry, Yamasumi Hospital 3Watanabe Clinic 4Department of Neuropsychiatry, Showa University 5Department of Radiology, Yokohama City Hospital Keyword: confabulation , nonaphasic misnaming , thalamus , frontal lobe pp.530-535
Published Date 2003/6/1
DOI https://doi.org/10.11477/mf.1406100502
  • Abstract
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A 72-year-old right handed woman developed amnesia, confabulation and abnormal (bizarre) verbal response after the left thalamic infarction. Clinical features including disorientation, euphoria and various kinds of paraphasia coincided in nonaphasic misnaming. MR images showed that lesions involved the genu of the internal capsule, the anteroventral nucleus, the lateroventral nucleus, intralaminar nuclei, the mamillothalamic tract and the region around the ventral thalamus. 99mTc-HMPAO-SPECT revealed decreased uptake in the left frontal lobe, probably due to the disconnection from the thalamus. These findings suggest that the dysfunction of the thalamus (mainly ventrolateral) and the left frontal lobe caused the disturbance of the self-monitoring in the language use, which generated confabulation and nonaphasic misnaming in our case.


Copyright © 2003, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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