Acute and transient psychotic disorder as a rare early manifestation of late-onset sub-acute sclerosing panencephalitis

Subacute Sclerosing Panencephalitis (SSPE) is a rare, late complication of measles infection. Illness generally starts with intellectual dysfunction, personality changes, myoclonus and epileptic seizures but rarely, initial presentations may only have psychiatric symptoms. We report a case of late-onset SSPE, presenting with symptoms of acute and transient psychotic disorder in the absence of classical symptoms of SSPE.