Atrophy/immunology; Autoantibodies/immunology; Brain/immunology; Cerebral Hemorrhage/immunology; Encephalitis/immunology; Potassium Channels, Voltage-Gated/immunology; Adrenal Cortex Hormones/therapeutic use; Aged; Atrophy/pathology; Atrophy/physiopathology; Brain/pathology; Brain/physiopathology; Carcinoma, Squamous Cell/immunology; Cerebral Hemorrhage/pathology; Cerebral Hemorrhage/physiopathology; Dementia/etiology; Disease Progression; Encephalitis/pathology; Encephalitis/physiopathology; Hallucinations/etiology; Humans; Immunosuppression Therapy/methods; Lung Neoplasms/immunology; Magnetic Resonance Imaging; Male; Necrosis/immunology; Necrosis/pathology; Necrosis/physiopathology; Plasmapheresis; Psychomotor Agitation/etiology; Seizures/drug therapy; Seizures/etiology; Treatment Outcome