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Vascular dementia of Binswanger's type: clinical, neuroradiological and99mTc-HMPAO SPET study

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Abstract

In 24 patients with vascular dementia of Binswanger's type (VDBT) and 14 age-matched neurologically normal volunteers, we investigated the relationship between clinical features, white matter lesions (leucoaraiosis) and cerebral atrophy on computed tomography (CT) scan, and regional cerebral blood flow. All subjects underwent the Mini-Mental State Examination of Taiwan, version 1 (MMSE-T1), for assessing the severity of cognitive impairment. The patients were subdivided into two groups, one with mild to moderate (group I, MMSE-T1 scores: 11–24,n=ll), and the other with severe dementia (group II, MMSE-T1 scores: below 10,n=13). White matter degeneration was evaluated with densitometric methods. Loss of brain parenchyma was estimated with seven linear measurements (Evan's ratio, third ventricle ratio, width of temporal horn tip, anterior-posterior length of temporal horn, anterior-posterior length of Sylvian fissure and width of frontal interhemispheric fissure) by CT scans. Regional cerebral blood flow was determined with technetium-99m hexamethylpropylene amine oxime (HMPAO) single-photon emission tomography (SPET). In neuroimaging studies, subcortical leuco-araiosis was localized at the frontal region in group I patients and scattered diffusely in group II patients.99mTc-HMPAO SPET analysis revealed reduction of regional cerebral blood flow in the frontal lobe in group I patients and widespread reduction of regional cerebral blood flow in group II patients. A correlation between frontal leuco-araiosis and perfusion defect of the frontal pole was demonstrated in group I patients, showing findings typical of subcortical dementia. There was no difference in frontal atrophic measurements between group I patients and controls. Ratios of volumes of lost brain parenchyma and leuco-araiosis were significantly higher in group II patients than in the age-matched controls, corresponding to a diffuse cerebral perfusion defect. These results suggest that patients with VDBT have early frontal lobe involvement with posterior progression. Patients with mild VDBT are more likely to show reduction of frontal cerebral blood flow and leuco-araiosis, while those with severe VDBT are more likely to have diffuse leuco-araiosis, cerebral hypoperfusion and brain atrophy.

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Authors and Affiliations

  1. Department of Neurology, Tri-Service General Hospital and National Defense Medical Center, No. 8, Sec. 3, Tingchow Rd., Taipei, Taiwan, Republic of China

    Woei-Cherng Shyu, Jiann-Chyun Lin, Yaw-Don Hsu & Wen-Long Tsao

  2. Department of Nuclear Medicine, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, Republic of China

    Chih-Chieh Shen

  3. Department of Neuroradiology, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, Republic of China

    Chau-Chin Lee

  4. Department of Psychiatry, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, Republic of China

    I-Shin Shiah

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  1. Woei-Cherng Shyu
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Shyu, WC., Lin, JC., Shen, CC. et al. Vascular dementia of Binswanger's type: clinical, neuroradiological and99mTc-HMPAO SPET study. Eur J Nucl Med 23, 1338–1344 (1996). https://doi.org/10.1007/BF01367589

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  • DOI: https://doi.org/10.1007/BF01367589

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