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Seronegative dementia paralytica: report of a case
Abstract:
Dementia paralytica may present diagnostic difficulties when routine serological test using a non-treponemal antigen is non-reactive. We present an illustrative demented patient who initially had negative VDRL test both in his serum and cerebrospinal fluid. However, the brain biopsy specimen showed active meningoencephalitis. By special staining technique, a spiral organism was found in the brain exhibiting morphology perfectly compatible with treponema pallidum. Later in the course, the VDRL became reactive in the blood but remained non-reactive in the cerebrospinal fluid. On the basis of the experience of other workers in the field and ours with this patient, we advise the use of FTA-ABS test as a screening procedure in patients with neurological problems of possible syphilitic origin. We urge further research in this field.
Insights
Diagnosing dementia paralytica can be challenging with non-reactive VDRL tests. This case highlights the importance of the FTA-ABS test for neurological syphilis when initial tests are negative.
Area of Science:
- Neurology
- Infectious Diseases
- Pathology
Background:
- Dementia paralytica, a late neurosyphilis manifestation, poses diagnostic challenges, especially when routine serological tests are non-reactive.
- Non-treponemal antigen tests like VDRL may yield false-negative results in serum and cerebrospinal fluid (CSF).
Purpose of the Study:
- To illustrate a case of dementia paralytica with initially negative VDRL tests in serum and CSF.
- To emphasize the utility of alternative serological tests in diagnosing neurosyphilis.
Main Methods:
- Case presentation of a demented patient with initially negative serum and CSF VDRL tests.
- Histopathological examination of brain biopsy with special staining techniques to identify causative organisms.
- Follow-up serological testing (VDRL and FTA-ABS).
Main Results:
- Brain biopsy revealed active meningoencephalitis with spiral organisms consistent with Treponema pallidum.
- Initially negative VDRL in serum and CSF, later becoming reactive in serum but remaining negative in CSF.
- The FTA-ABS test is suggested as a valuable screening tool.
Conclusions:
- Dementia paralytica can present with false-negative VDRL results, complicating diagnosis.
- The FTA-ABS test is recommended for screening patients with neurological symptoms suggestive of syphilis.
- Further research into the diagnostic nuances of neurosyphilis is warranted.