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[Encephalitis caused by Rickettsia conorii without exanthema].
J Parra-Martínez1, J Sancho-Rieger, P Ortiz-Sánchez
1Hospital General Universitario de Valencia, Valencia, España.
Revista De Neurologia
|October 29, 2002
Summary
Mediterranean boutonneuse fever can cause encephalitis without the typical rash. Early doxycycline treatment is recommended for unknown encephalitis in endemic areas due to high mortality risks and good drug tolerance.
Area of Science:
- Neurology
- Infectious Diseases
- Medical Case Reports
Background:
- Mediterranean boutonneuse fever, caused by Rickettsia conorii, is endemic to the Mediterranean region.
- While serious forms like encephalitis are rare, they carry a high mortality rate.
- Diagnosis typically relies on the presence of exanthema, a characteristic rash.
Observation:
- A 27-year-old woman presented with encephalitis due to Rickettsia conorii without any exanthema.
- Initial symptoms included headache, fever, and generalized pain, progressing to seizures and left-sided hemiparesis.
- Brain MRI revealed meningeal enhancement and a right parasylvian lesion, while CSF analysis was initially inconclusive.
Findings:
- The patient was diagnosed with Rickettsia conorii encephalitis based on serological testing (IgM+, IgG 1/256).
- Treatment involved anticonvulsants (phenytoin, valproate, clonazepam, phenobarbital), antibiotics (ceftriaxone, doxycycline), and corticosteroids (methylprednisolone).
- The patient achieved seizure control and showed no neurological deficit after eight months.
Implications:
- This case highlights that Rickettsia conorii encephalitis can occur without the typical exanthema.
- In endemic areas, empirical early treatment with doxycycline for encephalitis of unknown etiology is advisable.
- Prompt treatment is crucial given the high mortality associated with untreated Rickettsia conorii encephalitis.