Symptomatology may be very atypical: eg. cranial nerve involvement, dyspnea, swallowing impairment, pain syndrome -weakness may worsen within hours
Not indicated for idiopathic GBS, however some case reports show interesting results with ICPI induced GBS with methylprednisolone 1-2mg/kg (check literature). Among the neurology community discussion is ongoing if ICPI induced GBS is similar to chronic inflammatory demyelinating polyneuropathy (CIDP). The latter has a similar symptoms as GBS but has a slower onset and in contrast to GBS, for CIDP corticoids are indicated.