[Atypical computed tomographic appearance of herpes simplex encephalitis]

In cases of herpes simplex encephalitis, a low density lesion in the temporal lobe is a common CT finding, whereas hemorrhagic lesion is rarely observed on CT in this disorder despite the frequent occurrence on pathologic studies. Two cases of hemorrhagic lesion observed on CT in herpes simplex encephalitis are reported, and atypical CT findings of herpes simplex encephalitis is discussed.