Encephalitis: Difference between revisions
From IDWiki
(linkified) |
m (Text replacement - " species]]" to "]]") |
||
(4 intermediate revisions by the same user not shown) | |||
Line 1: | Line 1: | ||
− | * |
+ | *Infection of the brain parenchyma causing clouding of the sensorium |
− | * |
+ | *Some overlap with [[meningitis]] |
− | == |
+ | ==Differential Diagnosis== |
+ | *Common causes include [[HSV]], [[VZV]], and [[enterovirus]] in developed countries |
||
⚫ | |||
+ | *Consider [[rabies virus]], [[Japanese encephalitis virus]], [[West Nile virus]], [[tickborne encephalitis virus]], and [[St. Louis encephalitis virus]] depending on travel history |
||
⚫ | |||
⚫ | |||
− | *** [[Enteroviruses]] |
||
⚫ | |||
− | *** [[Eastern equine encephalitis|Eastern]] or [[Western equine encephalitis]], [[Japanese encephalitis]], [[Murray Valley encephalitis]], [[St. Louis encephalitis]], [[West Nile virus]] |
||
− | *** |
+ | ***[[Herpes simplex encephalitis|Herpes simplex virus]] |
− | *** |
+ | ***[[Varicella-zoster virus]] |
− | *** |
+ | ***[[Enterovirus|Enteroviruses]] |
− | *** [[ |
+ | ***[[Eastern equine encephalitis virus|Eastern]] or [[Western equine encephalitis virus]], [[Japanese encephalitis virus]], [[Murray Valley encephalitis virus]], [[St. Louis encephalitis virus]], [[West Nile virus]] |
+ | ***[[Rabies virus]] |
||
⚫ | |||
− | *** |
+ | ***[[Hendra virus]] |
− | *** |
+ | ***[[Nipah virus]] |
+ | ***[[Tickborne encephalitis virus]], [[La Crosse virus]], [[Powassan virus]] |
||
− | *** ''[[Borrelia burgdorferi]]'' (Lyme disease) |
||
⚫ | |||
− | *** ''[[Coxiella burnetii]]'' |
||
+ | ***''[[Mycoplasma pneumoniae]]'' |
||
− | *** ''[[Bartonella henselae]]'' or ''[[B. quintana]]'' |
||
+ | ***''[[Listeria monocytogenes]]'' |
||
⚫ | |||
− | *** |
+ | ***''[[Borrelia burgdorferi]]'' (Lyme disease) |
− | *** |
+ | ***''[[Coxiella burnetii]]'' |
− | *** ''[[ |
+ | ***''[[Bartonella henselae]]'' or ''[[B. quintana]]'' |
⚫ | |||
⚫ | |||
+ | ***''[[Cryptococcus neoformans]]'' |
||
⚫ | |||
+ | ***''[[Toxoplasma gondii]]'' |
||
⚫ | |||
+ | ***''[[Bayliscarias procyonis]]'' |
||
⚫ | |||
⚫ | |||
⚫ | |||
⚫ | |||
⚫ | |||
⚫ | |||
⚫ | |||
⚫ | |||
⚫ | |||
+ | *'''Cryptogenic in 50-70%''' |
||
− | == |
+ | ==Investigations== |
− | * |
+ | *Lumbar puncture for viral culture or PCR |
− | * |
+ | *MRI is the best neuroimaging; CT if MRI not available |
− | * |
+ | *EEG is rarely helpful except to rule out non-convulsive status epilepticus |
− | == |
+ | ===MRI=== |
+ | {| class="wikitable" |
||
+ | !Finding |
||
+ | !Differential Diagnosis |
||
+ | |- |
||
+ | |arteritis and infarctions |
||
+ | |[[Varicella-zoster virus]], [[Nipah virus]], [[Rickettsia rickettsii]], [[Treponema pallidum pallidum]] |
||
+ | |- |
||
+ | |calcifications |
||
+ | |[[CMV]] (cortical), [[Toxoplasma]] (periventricular), [[Taenia solium]] |
||
+ | |- |
||
+ | |cerebellar lesions |
||
+ | |[[VZV]], [[EBV]], [[Mycoplasma pneumoniae]] |
||
+ | |- |
||
+ | |basal ganglia, thalamus, or brainstem lesions |
||
+ | |[[EBV]], [[eastern equine encephalitis virus]], [[Murray Valley encephalitis virus]], [[St. Louis encephalitis virus]], [[Japanese encephalitis virus]], [[West Nile virus]], [[enterovirus]] A71, [[influenza virus]], [[prion disease]], [[Tropheryma whipplei]], [[Listeria monocytogenes]] |
||
+ | |- |
||
+ | |hydrocephalus |
||
+ | |[[Mycobacterium tuberculosis]], [[Cryptococcus neoformans]], [[Coccidioides immitis]], [[Histoplasma capsulatum]], [[Balamuthia mandrillaris]] |
||
+ | |- |
||
+ | |space-occupying lesions |
||
+ | |[[Toxoplasma gondii]], [[Balamuthia mandrillaris]], [[Acanthamoeba]], [[Taenia solium]] |
||
+ | |- |
||
+ | |subependymal enhancement |
||
+ | |[[CMV]] |
||
+ | |- |
||
+ | |temporal or frontal lobe involvement |
||
+ | |[[HSV]], [[VZV]], [[HHV-6]], [[West Nile virus]], [[enterovirus]], [[Treponema pallidum pallidum]] (medial lobes) |
||
+ | |- |
||
+ | |white matter abnormalities |
||
+ | |[[VZV]], [[CMV]], [[EBV]], [[HHV-6]], [[HIV]], [[Nipah virus]], [[JC virus]], [[measles virus]], [[Baylisascaris procyonis]], [[acute disseminated encephalomyelitis]] |
||
+ | |} |
||
+ | ==Management== |
||
⚫ | |||
+ | |||
⚫ | |||
+ | *Add [[doxycycline]] if [[Rickettsiae|rickettsiosis]] or [[ehrlichiosis]] is possible |
||
[[Category:CNS infections]] |
[[Category:CNS infections]] |
Latest revision as of 12:46, 25 January 2022
- Infection of the brain parenchyma causing clouding of the sensorium
- Some overlap with meningitis
Differential Diagnosis
- Common causes include HSV, VZV, and enterovirus in developed countries
- Consider rabies virus, Japanese encephalitis virus, West Nile virus, tickborne encephalitis virus, and St. Louis encephalitis virus depending on travel history
- Infectious
- Viruses
- Herpes simplex virus
- Varicella-zoster virus
- Enteroviruses
- Eastern or Western equine encephalitis virus, Japanese encephalitis virus, Murray Valley encephalitis virus, St. Louis encephalitis virus, West Nile virus
- Rabies virus
- Hendra virus
- Nipah virus
- Tickborne encephalitis virus, La Crosse virus, Powassan virus
- Bacteria
- Other
- Viruses
- Non-infectious (including post-infectious)
- Cryptogenic in 50-70%
Investigations
- Lumbar puncture for viral culture or PCR
- MRI is the best neuroimaging; CT if MRI not available
- EEG is rarely helpful except to rule out non-convulsive status epilepticus
MRI
Management
- Empiric acyclovir 10 mg/kg IV q8h for suspected HSV or VZV encephalitis
- Add doxycycline if rickettsiosis or ehrlichiosis is possible