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Deprecated: Implicit conversion from float 229.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Acta+Neuropathol 2017 ; 133 (3): 409-15 Nephropedia Template TP
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Reduced vascular amyloid burden at microhemorrhage sites in cerebral amyloid angiopathy #MMPMID27771772
van Veluw SJ; Kuijf HJ; Charidimou A; Viswanathan A; Biessels GJ; Rozemuller AJM; Frosch MP; Greenberg SM
Acta Neuropathol 2017[]; 133 (3): 409-15 PMID27771772show ga
Microhemorrhages are strongly associated with advanced cerebral amyloid angiopathy (CAA). Although it has been frequently proposed that the deposition of A? in the walls of cortical vessels directly causes microhemorrhages, this has not been studied in great detail, mainly because the ruptured vessels are often missed on routine histopathologic examination. Here, we examined histopathological data from studies targeting microhemorrhages with high-resolution ex vivo 7 T MRI in nine cases with moderate-to-severe CAA, and assessed the presence of A? in the walls of involved vessels. We also assessed the density of A? positive cortical vessels in areas surrounding microhemorrhages compared to control areas. In seven out of 19 microhemorrhages, the presumed involved vessel could be identified on the histopathological section. Only one of these vessels was positive for A? at the site of rupture. Moreover, the density of A? positive cortical vessels was lower (1.0 per mm2) within a range of 315 µm surrounding the microhemorrhage, compared to control areas (2.0 per mm2; p < 0.05). These findings question the widely held assumption that the deposition of A? in the walls of cortical vessels directly causes microhemorrhages.Electronic supplementary material: The online version of this article (doi:10.1007/s00401-016-1635-0) contains supplementary material, which is available to authorized users.