Syphilitic limbic encephalitis revealed by status epilepticus

Area of Science:

• Neurology
• Infectious Diseases
• Neuroimmunology

Background:

• Limbic encephalitis (LE) is an inflammatory neurological disorder affecting the limbic system, presenting with diverse neuropsychiatric symptoms.
• While various causes exist, syphilis is an infrequent etiology of limbic encephalitis.
• Neurosyphilis, a late-stage manifestation of syphilis, can present with a wide spectrum of neurological complications.

Observation:

• A 50-year-old male presented with an unusual initial symptom of status epilepticus, which led to the diagnosis of syphilitic limbic encephalitis.
• Diagnostic evaluation integrated clinical presentation, biological markers (blood and cerebrospinal fluid tests), and magnetic resonance imaging (MRI) findings.
• The patient exhibited mesiotemporal signal abnormalities on MRI, indicative of limbic system inflammation.

Findings:

• The patient received prompt and specific treatment for neurosyphilis.
• Following treatment, significant improvement in neuropsychological symptoms was observed.
• Laboratory tests, including the Venereal Disease Research Laboratory (VDRL) test in blood and cerebrospinal fluid, became negative.
• MRI scans demonstrated a regression of the mesiotemporal signal abnormalities.

Implications:

• This case highlights the importance of considering syphilis in the differential diagnosis of limbic encephalitis, even in the absence of typical symptoms.
• Early and accurate diagnosis of neurosyphilis is crucial for effective management and improved patient outcomes.
• Successful treatment of syphilitic LE can lead to neurological recovery and resolution of inflammatory changes on neuroimaging.