Mild encephalitis/encephalopathy with a reversible splenial lesion (MERS) in a patient presenting with papilledema

Excerpt

MERS is a clinically mild encephalitis/encephalopathy characterized by the MRI finding of a reversible lesion with transiently reduced diffusion in the corpus callosum at least involving the splenium of the corpus callosum (SCC) [1]. The most common neurological symptom is delirious behavior, followed by consciousness disturbance, and seizures, all of which completely recover within a month. Takanashi et al. [2] first described a solitary lesion in the splenium of the corpus callosum on magnetic resonance imaging (MRI) in two patients with influenza-associated encephalitis/encephalopathy in 2004. Such lesions of the SCC are reported various types of viral infections [3, 4]. In this paper, we report on an adult patient who presented with papilledema diagnosed as MERS due to viral encephalitis/encephalopathy. …