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What Is Neurosyphilis?

Neurosyphilis is infection of the central nervous system by Treponema pallidum, the bacterium that causes syphilis. It can occur at any stage of syphilis and leads to a wide range of neurologic and psychiatric symptoms. Presentations include meningitis, stroke like episodes from vasculitis, tabes dorsalis, and general paresis. Ocular involvement can feature uveitis, optic neuropathy, and cranial nerve palsies. Neurosyphilis needs prompt recognition because appropriate antibiotics can halt progression and improve outcomes.

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What Is Neurosyphilis?

Neurosyphilis is infection of the central nervous system by Treponema pallidum, the bacterium that causes syphilis. It can occur at any stage of syphilis and leads to a wide range of neurologic and psychiatric symptoms. Presentations include meningitis, stroke like episodes from vasculitis, tabes dorsalis, and general paresis. Ocular involvement can feature uveitis, optic neuropathy, and cranial nerve palsies. Neurosyphilis needs prompt recognition because appropriate antibiotics can halt progression and improve outcomes.

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Clinical Forms and Symptoms

Early neurosyphilis often presents as meningitis with headache, stiff neck, cranial nerve palsies, and hearing loss. Meningovascular disease causes inflammation of blood vessels in the brain or spinal cord, leading to stroke like deficits in relatively young adults. Late neurosyphilis includes tabes dorsalis, with lightning pains and gait ataxia, and general paresis with personality change and cognitive decline. Ocular syphilis can occur alongside these forms or as a presenting feature, with blurred vision, floaters, or photophobia. Any unexplained uveitis or optic neuropathy can prompt testing.

Diagnosis and Laboratory Testing

Diagnosis requires serologic tests for syphilis combined with cerebrospinal fluid analysis. Non treponemal tests such as VDRL and treponemal tests such as FTA ABS are checked in serum. Lumbar puncture looks for elevated protein, lymphocytic pleocytosis, and a reactive CSF VDRL, which is specific when positive. Neuroimaging can show infarcts, atrophy, or meningeal enhancement in some cases. Screening for HIV and other sexually transmitted infections is part of the evaluation.

Ocular Manifestations and Eye Examination

Neurosyphilis can produce a variety of eye findings, sometimes grouped under ocular syphilis. These include anterior, intermediate, or posterior uveitis; retinitis; chorioretinitis; and vasculitis. Optic neuritis and optic atrophy can lead to significant vision loss. Argyll Robertson pupils that react to near but not to light are a classic sign in late disease. Dilated fundus examination and imaging such as optical coherence tomography and fluorescein angiography help document retinal and choroidal involvement.

Treatment and Follow-Up

Treatment consists of high dose intravenous penicillin for a defined course, with desensitization when needed in penicillin allergy. Alternative regimens are considered only when penicillin cannot be used safely. Clinical follow up includes serial neurologic and ophthalmic examinations and repeat lumbar punctures to track CSF response. Some eye inflammation needs adjunctive corticosteroids under close supervision. People are counseled about partner notification, repeated serologic testing, and the importance of treating coexisting infections such as HIV.

FAQs About Neurosyphilis

Can neurosyphilis occur even if I never noticed a chancre or rash?

Yes, many people miss early signs of syphilis, and infection can still progress to neurologic involvement later.

Is ocular syphilis always a sign of neurosyphilis?

Ocular involvement is treated with the same regimens used for neurosyphilis, and central nervous system infection is often assumed or confirmed.

Can neurosyphilis be cured?

Appropriate antibiotic therapy can clear active infection, but some neurologic or visual damage can persist if treatment is delayed.

Should sexual partners be tested if I have neurosyphilis?

Yes, current and recent partners should be tested and treated according to public health guidelines.

References

Centers for Disease Control and Prevention (CDC). ?Neurosyphilis, Ocular Syphilis, and Otosyphilis.? https://www.cdc.gov/std/treatment-guidelines/neurosyphilis.htm

National Institutes of Health (NIH). ?Neurosyphilis.? https://www.ncbi.nlm.nih.gov/books/NBK540979/

National Institute of Neurological Disorders and Stroke (NINDS). ?Neurosyphilis.? https://www.ninds.nih.gov/health-information/disorders/neurosyphilis

World Health Organization (WHO). ?Syphilis.? https://www.who.int/news-room/fact-sheets/detail/syphilis

MedlinePlus. ?Neurosyphilis.? https://medlineplus.gov/ency/article/000703.htm