Tabes Dorsalis, also known as locomotor ataxia or syphilitic myelopathy, is a rare, chronic, and progressive neurological disorder that is a complication of untreated (or inadequately treated) syphilis. It is a form of late neurosyphilis, meaning the neurological symptoms manifest many years, often decades (15-30 years), after the initial syphilis infection.
The sole cause of Tabes Dorsalis is infection with Treponema pallidum, the bacterium responsible for syphilis. When the syphilis infection is left untreated, or sometimes only partially treated, the bacteria can invade the central nervous system (CNS), specifically targeting the dorsal columns (posterior columns) and dorsal roots of the spinal cord.
The damage to these structures is primarily due to demyelination (loss of the myelin sheath that insulates nerve fibers) and degeneration of the nerve cells and fibers. This disruption of sensory pathways leads to the characteristic symptoms of Tabes Dorsalis.
Due to widespread screening and effective antibiotic treatment for syphilis, Tabes Dorsalis has become extremely rare in developed countries. However, it can still occur, especially in individuals with untreated or undiagnosed syphilis, and there’s some concern about its re-emergence with rising syphilis rates in certain populations.
The symptoms of Tabes Dorsalis are diverse and can be debilitating, often progressing slowly over time. They are primarily neurological due to the damage to sensory pathways.
Symptoms include:-
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