Favorable Outcomes in a Case of Non-paraneoplastic DNER Ataxia Treated with Immunotherapy.

Anti-DNER antibody is associated with paraneoplastic cerebellar degeneration (PCD) and Hodgkin's disease (HD). However, recent studies reported cases absence of HD and that non-tumor anti-DNER antibody-associated ataxia was not well characterized. We present a case of acute cerebellar ataxia and nystagmus with detected anti-DNER antibody. Brain magnetic resonance imaging (MRI) showed cerebellar atrophy. High titer of anti-DNER antibody was detected in CSF and serum. Positron emission tomography (PET) scanning was unremarkable at a 10-month follow up. The patient improved significantly after immunosuppressive therapy with intravenous steroids, immunoglobulin followed by rituximab. Our study suggest that the presence of such anti-neuronal antibodies might not come along with malignancy and that early onset non-tumor patients are more likely to have a better outcome after immunotherapy. Early diagnosis and timely immunosuppressive therapy may prove beneficial for these patients.