Gultekin criteria EITHER, Pathological demonstration of limbic encephalitis OR, All four of: Short-term memory loss, seizures, or psychiatric symptoms suggestive of limbic system involvement <4 years between onset of neurological symptoms and cancer diagnosis Exclusion of metastases, infection, metabolic and nutritional deficits, stroke and side-effects of therapy that may cause limbic encephalopathy At least one of CSF with inflammatory findings Hyperintensity of the temporal lobes bilaterally on MRI FLAIR or T2 EEG with epilepsy or slow activity involving the temporal lobes focally