Neuroradiographic Manifestations of Encephalitis

To the Editor: In their paper on neuroradiographic manifestations of eastern equine encephalitis, Deresiewicz et al. (June 26 issue)¹ report on the predilection of this disease for the basal ganglia, thalami, and brain stem. We would like to add another arboviral infection that can occur in areas in Europe in which the disease is endemic — namely, tick-borne encephalitis — to the differential diagnoses of basal ganglionic and thalamic lesions on magnetic resonance imaging (MRI) in patients with encephalitis. The virus is transmitted by ticks of the species Ixodes ricinus. Neuropathological studies stress the prominent involvement of the basal ganglia . . .