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LATE VASCULAR EFFECTS IN IRRADIATED MICE BRAIN:IN RELATION TO EXPERIMENAL RADIONECROSIS Yoshihiko Yoshii 1 , Yutaka Maki 1 1Department of Neurological Surgery, University of Tsukuba pp.281-289
Published Date 1982/3/1
DOI https://doi.org/10.11477/mf.1406204912

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  • Abstract
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The whole brains of mice were irradiated with 250 kVp X-ray at 120 rad min-1 (1.6 mm Cu HVL, TSD 50cm) and a histological study was done. The dose range of X-irradiation was from 1300 to 2500 rads. i.e.,1300, 1500, 1750, 2000, and 2500 rads. In the microscopic examination, the mice were killed at the regular postirradiation intervals of between 15 and 20, 31 and 40, 41 and 50, 51 and, 60, 61 and 70, 71 and 80, 81 and 90, 139 and 177 weeks.

A histological examination was performed by a morphometric estimation of vascular lesion in which the degree of the damage to the arterial system was scored through whole serial brain sections.

Necrosis (encephalomalacia), atrophy, cell infiltra-tion, and telangiectatic vascular change of the brain, caused as a result of the fibrinoid necrosis of the large artery were observed.

Incidence of the fibrinoid necrosis increased dose dependently between 41 and 87 weeks after irradiation.

Mean score of fibrinoid necrosis increased dose dependently approximately 60 weeks after irradia-tion.

It is suggested that scores of large vessel damage do relate to dose at 41-87 weeks and can be used to quantify the vessel injury and a fibrinoid ne-crosis of the large vessels may relate to the in-cidence of radioaecrosis.


Copyright © 1982, 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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