CDR2 and pathologic nystagmus: After this therapy, the patient experienced a rapid and progressive almost complete disappearance of the cerebellar symptoms characterized by diplopia, nystagmus, and eyelid ptosis; this response to therapy would seem to preclude the possible presence of anti-Hu and anti-Yo antibodies, characterized by an absence or low susceptibility to immunosuppressive therapy, favouring the form mediated by anti-Ri antibodies, even if not found.