A case of acute encephalopathy with biphasic seizures and late reduced diffusion associated with Streptococcus pneumoniae meningoencephalitis.

Acute encephalopathy with biphasic seizures and reduced diffusion (AESD) encompasses a group of encephalopathy characterized by biphasic seizures and disturbance of consciousness in the acute stage followed in the subacute stage by reduced diffusion in the subcortical white matter on magnetic resonance imaging. The etiology of AESD is viral infection and associated pathological changes. Here we report the first case of AESD caused by bacterial infection (Streptococcus pneumoniae meningitis) in a 1-year-old boy.