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Four weeks after 90 Gy irradiation, Masson staining was used to detect vascular injury. a Normal group. The vessel had a regular shape with lots of blood cells in the lumen; b 90Gy-4w group. In the arterial lumen, blood cells reduced, and tube wall was thickened. In the venous lumen, blood cells disappeared. A large amount of collagen fibers proliferated around the vessels
