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Non-contrast CT head (stroke window level 32 HU/ width 8 HU) shows obscuration of the left caudate and lentiform nucleus. There is loss of gray-white matter differentiation in the posterior portion of the left insula cortex and the left superior temporal gyrus. Dense vessel sign is present in the M1 and M2 segments of the left middle cerebral artery. The left fronto-parietal cortex maintain normal gray-white differentiation at this stage. No intraparenchymal haemorrhage.