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Increased vascular attenuation. A, Sagittal reformation from a noncontrast CT reveals high attenuation within the sagittal (arrow) and straight sinuses (arrowhead). The irregular appearance of the sagittal sinus is related to the cortical veins draining into the sinus. B, Axial noncontrast CT through the level of the circle of Willis reveals increased attenuation within the arteries. The beam-hardening artifact is related to the grommets on the human remains pouch.
