<prompt> Answer this question truthfullyWhat are the indications and symptoms of progressive encephalopathy accompanied by edema, hypsarrhythmia, and optic atrophy?  <response>: <reason> PEHO Progressive encephalopathy with Edema, Hypsarrhythmia and Optic atrophy syndrome is a rare neurodegenerative disorder belonging to the group of infantile progressive encephalopathies. 