If any doubt exists, further evaluation, including MRI scan preferably with contrast (compared with pre- treatment MRI), CSF testing for JC Viral DNA and repeat neurological assessments, should be considered as described in the Physician Information and Management Guidelines (see educational guidance).
V primeru dvoma je treba razmisliti o nadaljnji ocenitvi, vključno z magnetnoresonančnim slikanjem, po možnosti s kontrastom (primerjalno z MRT prejšnjega stanja), testiranjem CSF glede JC virusne DNK in ponovno nevrološko ocenitvijo, kot je opisano v informacijah za zdravnika in smernicah za obvladovanje bolezni (glejte smernice za usposabljanje).