CT scans of 180 cases of supratentorial infarction (including ischemic

lacunar and hemor-rhagic infarcts) were retrospectively analyzed. And other 12 cases were prospectively studied. On plain CT scans

the feature of isodensity of the cortex in some(18.4%) of ischemic infarction is called by the authors the "cortical sparing"

and proved to be a constant phenomenon during the evolution of the infarcts. The mechanism and importance of the cortical sparing is discussed. Fogging effect was also discovered during the fourth week of infarctions. The first week after attacks could be one of the peak periods when the infarcts hemorrhaged. In view of the fact that hemorrhagic infarctions most frequently occured in cerebral embolism and some cases had not apparent changes of clinical manifestations when they hemorrhaged

the authors put forward that it is important to give the patients a timely CT reexamination.The general CT manifestations of cerebral infarction were also analyzed and discussed