A rare case of suspected focal meningoencephalitis localized in the left occipital lobe was described. A 2-year-old girl, following upper respiratory illness, suddenly became lethargic and experienced a right-sided hemiconvulsion beginning from a right-side gaze. Cranial MRI clearly demonstrated high intensity on T2-weighted imaging in the cortex, white matter, and leptomeninges of the left occipital lobe, which disappeared in the convalescent phase. We consider that the MRI abnormalities reflected focal inflammation and edema, and corresponded to the presumed ictal focus.