A rare transmittable degenerative disorder of the brain caused by prions. Morphologically it is characterized by spongiform degeneration of the cerebral and cerebellar cortex. Signs and symptoms include sleep disturbances, personality changes, aphasia, ataxia, muscle atrophy and weakness, visual loss, and myoclonus. It usually leads to death within a year from the onset of the disease. The disease is Monarch Disease Ontology entry MONDO_0005357 (Creutzfeldt Jacob disease). Also known as: CJD, CJD (Creutzfeldt Jakob disease), Creutzfeldt Jacob syndrome, Creutzfeldt Jakob Disease, Creutzfeldt Jakob disease, Creutzfeldt-Jacob disease, Jakob-Creutzfeldt disease, Subacute spongiform encephalopathy.