An MRI scan showing neurosyphilis. Photograph: Dr Roberto Schubert
"Neurosyphilis" - Infection of the brain or spinal cord that occurs in untreated syphilis many years after initial infection.
Damage to the spinal cord due to neurosyphilis may cause tabes dorsalis, characterised by poor co-ordination of leg movements, urinary incontinence, and pains in the abdomen and limbs. Damage to the brain may cause dementia, muscle weakness, and, in rare cases, total paralysis of the limbs.
"neurosyphilis". British Medical Association (2007). Illustrated Medical Dictionary. 2nd ed. London: Dorling Kindersley (DK). p400.