Encephalitis, commonly referred to, is generally viral encephalitis. Herpes simplex viral encephalitis, a type of viral encephalitis, typically shows distinct manifestations in brain MRI scans. For instance, the patient's MRI may reveal high T2 signals in several areas of the cerebral cortex, particularly in the frontal and temporal lobes, and the hippocampus. If there are subsequent hemorrhagic changes, high signals will also appear on T1-weighted images. Additionally, the MRI of encephalitis may display diffusion-weighted imaging with unusually bright signals, and these signals do not follow a vascular distribution, which strongly suggests encephalitis. Patients with encephalitis generally exhibit significant symptoms such as fever, headache, nausea, and vomiting. In severe cases, they may also experience limb paralysis, psychiatric symptoms, and complications like epilepsy.