Fig. 1.
Examples of the four types of hyperdense lesions on the non-contrast CT obtained immediately after intra-arterial thrombolysis.
A. An example of a 'cortical high density (HD)' showing the focal high densities limited to the cortices.
B. An example of a 'soft HD' revealing a CT density of less than 80 HU without any bulging contour.
C. An example of a 'metallic HD' showing a CT density of over 80 HU and a larger volume with a bulging contour.
D. An example of a 'diffuse HD' with high density involving a large territory.
