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(a) Non-contrast CT image of the brain shows a linear hyperdensity in the M1 segment of the left middle cerebral artery (MCA; arrow), typical of the hyperdense MCA sign in a patient with left hemispheric stroke. (b) CT angiogram of the same patient shows absence of contrast enhancement in the M1 segment of the left MCA, corresponding to the location of the hyperdense MCA.
