Cited by 161Cerebrovascular and genetic disordersNeurological Disease Mechanisms and TreatmentsIntracerebral and Subarachnoid Hemorrhage Research

Neuropathological correlates of temporal pole white matter hyperintensities in CADASIL

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Yamamoto, Yumi, Ihara, Masafumi, Tham, Carina, Low, Roger W.C., Slade, Janet Y., Moss, Tim, Oakley, Arthur E., Polvikoski, Tuomo +1 more·2009·Stroke

Abstract

Background and Purpose— White matter (WM) hyperintensities on MRI or leukoaraiosis is characteristic of stroke syndromes. Increased MRI signals in the anterior temporal pole are suggested to be diagnostic for cerebral autosomal-dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), with 90% sensitivity and 100% specificity. The structural correlates of these specific WM hyperintensities seen on T2-weighted and FLAIR sequences in the temporal pole of CADASIL are unclear. We assessed pathological changes in postmortem tissue from the temporal pole to reveal the cause of CADASIL-specific WM hyperintensities. Methods— A combination of tinctorial and immunostaining approaches and in vitro imaging methods were used to quantify the extent of perivascular space (PVS), arteriosclerosis determined as the sclerotic index, WM myelination as the myelin index, and damage within the WM as accumulated degraded myelin basic protein in samples of the anterior temporal pole from 9 CADASIL and 8 sporadic subcortical ischemic vascular dementia cases, and 5 similarly aged (young) and 5 older controls. Luxol fast blue-stained serial sections from a CADASIL case were also used to reconstruct the temporal pole, which was then compared to the MR images. Results— Luxol fast blue sections used to reconstruct the temporal pole revealed an abundance of enlarged PVS in the WM that topographically appeared as indistinct opaque regions. The mean and total areas of the PVS per WM area (%PVS) were significantly greater in CADASIL compared to the controls. The myelin index was severely reduced in CADASIL in relation to the subcortical ischemic vascular dementia and control sample that was consistent with increased immunoreactivity of degraded myelin basic protein, indicating myelin degeneration. Cerebral microvessels associated with the PVS exhibited a 4.5-fold greater number of basophilic (hyalinized) vessels and a 57% increase in the sclerotic index values in CADASIL subjects compared to young controls. A significant correlation between the quantity of hyalinized vessels and sclerotic index values was also apparent ( P <0.05). Conclusions— Our findings suggest that MRI hyperintensities in the temporal pole of CADASIL patients are explained by enlarged PVS and degeneration of myelin accompanied by lack of drainage of the interstitial fluid rather than lacunar infarcts. Consistent with the lack of MR hypersignals in the temporal pole of older subcortical ischemic vascular dementia subjects, our observations imply greater progression of pathological changes in CADASIL patients.

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  • Yamamoto et al. (2009) proposed that MRI temporal pole hyperintensities in CADASIL reflect enlarged perivascular spaces together with myelin depletion and axonal damage.

    “They proposed that MRI temporal pole hyperintensities in CADASIL patients reflect enlarged PVS, together with myelin depletion and axonal damage.”

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  1. [4]Pfefferkorn T von Stuckrad-Barre S Herzog J Grasser T Hamann GF Dichgans M A transcranial Doppler sonography study Stroke 2001 32 17 21 11136908
  2. [11]Singhal S Rich P Markus HS The spatial distribution of MR imaging abnormalities in cerebral autosomal leukoencephalopathy and their relationships to age and clinical features AJNR Am J Neuroradiol 2005 26 2481 2487 16286388 PMC7976180

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Authors
Yamamoto, Y., Ihara, M., Tham, C., Low, R. W. C., Slade, J. Y., Moss, T., Oakley, A. E., Polvikoski, T., & Kalaria, R. N.
Affiliations
  • From Institute for Ageing and Health, Newcastle General Hospital, Westgate Road, Newcastle-upon-Tyne, United Kingdom.
  • Newcastle Hospitals - Campus for Ageing and Vitality (GB)
  • Newcastle upon Tyne Hospitals NHS Foundation Trust (GB)
Corresponding author
Kalaria, Raj N.
Venue
Stroke
Published
2009-06
Volume
40
Issue
6
Pages
2004-2011
ISSN
  • 0039-2499 (ISSN-L)
  • 1524-4628
OpenAlex
W2150076690
Cited by
155
References
44
Citations by year
2026: 4 · 2025: 14 · 2024: 10 · 2023: 7 · 2022: 5 · 2021: 14 · 2020: 13 · 2019: 7 · 2018: 6 · 2017: 13 · 2016: 7 · 2015: 7 · 2014: 14 · 2013: 7 · 2012: 7
FWCI
5.53
Type
journal article
Language
en
Open access
Locations
  • Stroke (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
  • Medical Research Council
  • National Institute of Neurological Disorders and Stroke (R21NS054047)
Topics
  • Health Sciences › Medicine › Neurology › Cerebrovascular and genetic disorders
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Neurology › Intracerebral and Subarachnoid Hemorrhage Research
Keywords
CADASIL, white matter hyperintensities, temporal pole, enlarged perivascular spaces, myelin degeneration, myelin basic protein, arteriosclerosis, subcortical vascular dementia, cerebral microvasculature, interstitial fluid drainage, neuropathology, postmortem brain, Luxol fast blue
MeSH terms
Adult, Aged, Aging, Algorithms, Capillaries, Female, Humans, Image Processing, Computer-Assisted, Immunohistochemistry, Magnetic Resonance Imaging, Male, Middle Aged, Myelin Sheath, Risk Factors, Sclerosis, Temporal Lobe, Dementia, Vascular, Paraffin Embedding, CADASIL

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