Cerebral lesion on CT scan was devided in four patterns: (A) no visible lesion or infarct in the posterior half of the superficial MCA territory; (B) Small infarct in the superficial of profond (not important structure) territory of the MCA; (C) infarct in the superficial territory of the MCA that involved at least its anterior half; and (D) large infarct (involved at least the profond and anterior half of the superficial territory of the MCA) or important deep infarct (involved the whole of posterior limb of the internal capsule or semioval centre).