tertiary syphilis neurosyphilis 94 http://id.loc.gov/authorities/subjects/sh85091177 http://purl.bioontology.org/ontology/MEDDRA/10029339 http://purl.bioontology.org/ontology/MESH/D009494 http://purl.bioontology.org/ontology/SNOMEDCT/26039008 http://purl.obolibrary.org/obo/NCIT_C84935 https://en.wikipedia.org/wiki/Neurosyphilis https://www.wikidata.org/wiki/Q7888578 Infection of the brain or spinal cord by Treponema pallidum. It occurs many years following the original infection which remained untreated. Signs and symptoms include abnormal gait, blindness, depression, paralysis, seizures and dementia. treponema pallidum infection