Summary
The whole brains of mice were irradiated with 250 kVp X-rays at 120 rads min−1 (1.6 mm Cu HVL, TSD 50 cm), and a histological study was carried out. The dose range of X-irradiation was from 1,300 to 2,500 rads,i.e., 1,300, 1,500, 1,750, 2,000, and 2,500 rads.
Eighty-six mice were used for histological examination. For microscopic examination, the mice were killed at regular postirradiation intervals 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. The brains were removed immediately thereafter, fixed in Bouin's solution, and embedded in paraffin.
A histological examination was performed by a morphometric estimation of vascular lesions, in which the degree of the damage to the arterial system was scored in whole serial brain sections.
Necrosis (encephalomalacia), atrophy, cell infiltration, and telangiectatic vascular change of the brain, caused as a result of the fibrinoid necrosis of the large arteries, were observed.
Dose-dependent incidence of the fibrinoid necrosis increased between 41 and 87 weeks after irradiation.
Mean score of fibrinoid necrosis increased dose dependently approximately 60 weeks after irradiation.
It is suggested that scores of large vessel damage do relate to dose at 41 to 87 weeks, and can be used to quantify the vessel injury, and that fibrinoid necrosis of the large vessels may relate to the incidence of radionecrosis.
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Yoshii, Y., Phillips, T.L. Late vascular effects of whole brain X-irradiation in the mouse. Acta neurochir 64, 87–102 (1982). https://doi.org/10.1007/BF01405622
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DOI: https://doi.org/10.1007/BF01405622