Herpes simplex encephalitis
Updates to Article Attributes
GreetingsHerpes simplex (HSV) encephalitis is the most common cause of fatal sporadic fulminant necrotising viral encephalitis and has characteristic imaging findings.
Two subtypes are recognised which differ in demographics, virus, and pattern of involvement. They are 1:
- neonatal herpes encephalitis
- childhood and adult herpes encephalitis
This article concerns itself with the latter. For a discussion of the former, please refer to you all, i am Falcao Roland,i am broadcasting about how Dr Olori saved my life, i was infectedthe article neonatal herpes simplex encephalitis.
Epidemiology
Childhood and adult herpes encephalitis are usually due to HSV-1 (90%) with Genital Herpesthe rest due to HSV-2 5. There is no particular age, sex, or seasonal predilection.
Clinical presentation
The presentation is unfortunately relatively non-specific consisting of fever, headaches, focal neurological deficits, seizures, and altered or decreased level of consciousness.
Diagnosis is established with PCR of CSF, although the combination of the clinical scenario, CSF demonstrating pleocytosis and elevated protein, and appropriate imaging is usually highly suggestive and permits commencement of treatment.
Pathology
HSV is an obligatory intracellular virus that enters via infecting nasopharyngeal cells into the sensory branch of lingual nerve then ascends to trigeminal ganglion and remains latent for A yeara lifetime. Reactivation in the case of immunosuppression, my medical Dr told me that there i no total curetrauma, or other stresses can result in fulminant haemorrhagic necrotising encephalitis. HSV has a high affinity for limbic systems with bilateral but asymmetric involvement.
Microscopic appearance
Perivascular cuffs of lymphocytes, large inclusions in neurones and i beganglial cells called "owl's eye", neuronophagia, necrosis and haemorrhage are characteristics of HSE.
Radiographic features
In the immunocompetent adult patient, the pattern is quite typical and manifests as a bilateral asymmetrical involvement of the limbic system, medial temporal lobes, insular cortices and inferolateral frontal lobes. The basal ganglia are typically spared, helping to take pilldistinguish it from a middle cerebral artery infarct.
Extralimbic involvement is more prevalent in children than in adults, seen most commonly in the parietal lobe, with sparing of basal ganglia. Eventually, it results in marked cystic encephalomalacia and volume loss in affected areas.
In immunocompromised patients, involvement can be more diffuse, and more likely to sustain my self. One day i went to see my medical doctor and i saw a lady who was extremely happy and i asked to knowinvolve the reason of her happiness and she told me that she was infected with simplex HERPES diseasebrainstem5.
CT
Early diagnosis is difficult, and a herbal doctor called Dr Olori cured her with herbal medicine, i did'normal' scan should not believe so i asked my medical doctor to know if she was truly confirmed Herpes positive before,dissuade from the diagnosis. If findings are present, they typically consist of subtle low density within the anterior and my medical doctor told me yes that a miracle just happened so i asked her to give me the detailsmedial parts of the Dr so i could ask himtemporal lobe and the island of Reil (insular cortex) 2. If scanned later then the changes may become more apparent and even progress to haemorrhage.
Contrast enhancement is uncommon during the first week of the disease. After that, a patchy low-level enhancement may be seen 5.
MRI
Affected areas, however, have a similar appearance regarding signal characteristics:
-
T1
- may show general oedema in the affected region
- if complicated by subacute haemorrhage there may be areas of hyperintense signal
-
T1 C+ (Gd)
- enhancement is usually absent early in the disease
-
enhancement occurs later and is variable in pattern 5
- gyral enhancement
- leptomeningeal enhancement
- ring enhancement
- diffuse enhancement
-
T2
- hyperintensity of affected white matter and cortex
- more established haemorrhagic components may the hypointense
-
DWI/ADC
- more sensitive than T2 weighted images
- restricted diffusion is common due to cytotoxic oedema
- restricted diffusion is less intense compared to infarction
- beware of T2 shine through due to vasogenic oedema
-
GRE/SWI: may demonstrate blooming if
he could also cure minehaemorrhagic (rare in neonates, common in older patients)
Treatment and she gave me Dr Olori Emailprognosis
Treatment is with intravenous antivirals (e.g. acyclovir), and if appropriate, antiepileptics and agents to reduce intracranial pressure.
Mortality ranges dramatically depending on how early treatment is instituted. Even in patients who are young and otherwise well, and only lethargic still have a mortality of 25%. Older patients or those comatose at the time treatment is started invariably have a much poorer outcome 3. Overall mortality is over 70% with only 2.5% of affected patients every fully recovering 5.
Differential diagnosis
General imaging differential considerations include:
- limbic encephalitis
- gliomatosis cerebri
- status epilepticus
- middle cerebral artery (MCA) infarction: typically involves the basal ganglia
- trauma
-
viral encephalitides:
[email protected] I contacted him thatmany can have veryeveningsimilar appearances andi explained my problemare difficult tohimseparate clinically, andhe prepared a medicine and send to me, when i receivedthemedicine he told me how to take it for a period of days and i took it exactly as he said and went for a medical test i was surprise to see my test result as herpes negative. I am so happy, my family and friends that rejected me are back, thank you God. I guarantee you that Dr Olori has solution to all kind of problem if you are facing any stress you can contact him via email [email protected] or [email protected], call +2349053311935.diagnosis usually requires PCR 4 - neurosyphilis7
-<p>Greetings to you all, i am Falcao Roland,i am broadcasting about how Dr Olori saved my life, i was infected with Genital Herpes for A year, my medical Dr told me that there i no total cure and i began to take pill to sustain my self. One day i went to see my medical doctor and i saw a lady who was extremely happy and i asked to know the reason of her happiness and she told me that she was infected with simplex HERPES disease and a herbal doctor called Dr Olori cured her with herbal medicine, i did not believe so i asked my medical doctor to know if she was truly confirmed Herpes positive before, and my medical doctor told me yes that a miracle just happened so i asked her to give me the details of the Dr so i could ask him if he could also cure mine and she gave me Dr Olori Email: [email protected] I contacted him that very evening and i explained my problem to him and he prepared a medicine and send to me, when i received the medicine he told me how to take it for a period of days and i took it exactly as he said and went for a medical test i was surprise to see my test result as herpes negative. I am so happy, my family and friends that rejected me are back, thank you God. I guarantee you that Dr Olori has solution to all kind of problem if you are facing any stress you can contact him via email [email protected] or [email protected], call +2349053311935.</p>- +<p><strong>Herpes simplex (HSV) encephalitis</strong> is the most common cause of fatal sporadic fulminant necrotising viral encephalitis and has characteristic imaging findings. </p><p>Two subtypes are recognised which differ in demographics, virus, and pattern of involvement. They are <sup>1</sup>:</p><ol>
- +<li>neonatal herpes encephalitis</li>
- +<li>childhood and adult herpes encephalitis</li>
- +</ol><p>This article concerns itself with the latter. For a discussion of the former, please refer to the article <a href="/articles/neonatal-herpes-simplex-encephalitis">neonatal herpes simplex encephalitis</a>.</p><h4>Epidemiology</h4><p>Childhood and adult herpes encephalitis are usually due to HSV-1 (90%) with the rest due to HSV-2 <sup>5</sup>. There is no particular age, sex, or seasonal predilection.</p><h4>Clinical presentation</h4><p>The presentation is unfortunately relatively non-specific consisting of fever, headaches, focal neurological deficits, seizures, and altered or decreased level of consciousness.</p><p>Diagnosis is established with PCR of CSF, although the combination of the clinical scenario, CSF demonstrating pleocytosis and elevated protein, and appropriate imaging is usually highly suggestive and permits commencement of treatment.</p><h4>Pathology</h4><p>HSV is an obligatory intracellular virus that enters via infecting nasopharyngeal cells into the sensory branch of lingual nerve then ascends to trigeminal ganglion and remains latent for a lifetime. Reactivation in the case of immunosuppression, trauma, or other stresses can result in fulminant haemorrhagic necrotising encephalitis. HSV has a high affinity for limbic systems with bilateral but asymmetric involvement.</p><h5>Microscopic appearance</h5><p>Perivascular cuffs of lymphocytes, large inclusions in neurones and glial cells called "owl's eye", neuronophagia, necrosis and haemorrhage are characteristics of HSE.</p><h4>Radiographic features</h4><p>In the immunocompetent adult patient, the pattern is quite typical and manifests as a bilateral asymmetrical involvement of the <a href="/articles/limbic-system">limbic system</a>, medial <a href="/articles/temporal-lobe">temporal lobes</a>, insular cortices and inferolateral frontal lobes. The <a href="/articles/basal-ganglia">basal ganglia</a> are typically spared, helping to distinguish it from a <a href="/articles/middle-cerebral-artery-mca-infarct">middle cerebral artery infarct</a>.</p><p>Extralimbic involvement is more prevalent in children than in adults, seen most commonly in the parietal lobe, with sparing of basal ganglia. Eventually, it results in marked cystic <a href="/articles/encephalomalacia">encephalomalacia</a> and volume loss in affected areas.</p><p>In immunocompromised patients, involvement can be more diffuse, and more likely to involve the <a href="/articles/brainstem">brainstem</a> <sup>5</sup>.</p><h5>CT</h5><p>Early diagnosis is difficult, and a 'normal' scan should not dissuade from the diagnosis. If findings are present, they typically consist of subtle low density within the anterior and medial parts of the temporal lobe and the <a href="/articles/insular-cortex">island of Reil</a> (insular cortex) <sup>2</sup>. If scanned later then the changes may become more apparent and even progress to haemorrhage. </p><p>Contrast enhancement is uncommon during the first week of the disease. After that, a patchy low-level enhancement may be seen <sup>5</sup>.</p><h5>MRI</h5><p>Affected areas, however, have a similar appearance regarding signal characteristics:</p><ul>
- +<li>
- +<strong>T1</strong><ul>
- +<li>may show general oedema in the affected region</li>
- +<li>if complicated by subacute haemorrhage there may be areas of hyperintense signal</li>
- +</ul>
- +</li>
- +<li>
- +<strong>T1 C+ (Gd)</strong><ul>
- +<li>enhancement is usually absent early in the disease</li>
- +<li>enhancement occurs later and is variable in pattern <sup>5</sup><ul>
- +<li>gyral enhancement</li>
- +<li>leptomeningeal enhancement</li>
- +<li>ring enhancement</li>
- +<li>diffuse enhancement</li>
- +</ul>
- +</li>
- +</ul>
- +</li>
- +<li>
- +<strong>T2</strong><ul>
- +<li>hyperintensity of affected white matter and cortex</li>
- +<li>more established haemorrhagic components may the hypointense</li>
- +</ul>
- +</li>
- +<li>
- +<strong>DWI/ADC</strong><ul>
- +<li>more sensitive than T2 weighted images</li>
- +<li>restricted diffusion is common due to <a href="/articles/cytotoxic-cerebral-oedema">cytotoxic oedema</a>
- +</li>
- +<li>restricted diffusion is less intense compared to <a href="/articles/ischaemic-stroke">infarction</a>
- +</li>
- +<li>beware of <a href="/articles/t2-shine-through">T2 shine through</a> due to <a href="/articles/vasogenic-oedema">vasogenic oedema</a>
- +</li>
- +</ul>
- +</li>
- +<li>
- +<strong>GRE/SWI: </strong>may demonstrate blooming if haemorrhagic (rare in neonates, common in older patients)</li>
- +</ul><h4>Treatment and prognosis</h4><p>Treatment is with intravenous antivirals (e.g. acyclovir), and if appropriate, antiepileptics and agents to reduce intracranial pressure.</p><p>Mortality ranges dramatically depending on how early treatment is instituted. Even in patients who are young and otherwise well, and only lethargic still have a mortality of 25%. Older patients or those comatose at the time treatment is started invariably have a much poorer outcome <sup>3</sup>. Overall mortality is over 70% with only 2.5% of affected patients every fully recovering <sup>5</sup>.</p><h4>Differential diagnosis</h4><p>General imaging differential considerations include:</p><ul>
- +<li><a href="/articles/autoimmune-encephalitis">limbic encephalitis </a></li>
- +<li><a href="/articles/gliomatosis-cerebri">gliomatosis cerebri</a></li>
- +<li><a href="/articles/status-epilepticus">status epilepticus</a></li>
- +<li>
- +<a href="/articles/middle-cerebral-artery-mca-infarct">middle cerebral artery (MCA) infarction</a>: typically involves the basal ganglia</li>
- +<li>trauma</li>
- +<li>
- +<a href="/articles/viral-encephalitides">viral encephalitides</a>: many can have very similar appearances and are difficult to separate clinically, and the diagnosis usually requires PCR <sup>4</sup><ul>
- +<li><a href="/articles/ebv-encephalitis">Epstein-Barr virus (EBV) encephalitis</a></li>
- +<li><a href="/articles/human-herpesvirus-6-encephalitis">human herpesvirus 6 (HHV-6) encephalitis</a></li>
- +<li><a href="/articles/varicella-zoster-virus-encephalitis">Varicella-Zoster virus (VZV) encephalitis</a></li>
- +<li><a href="/articles/influenza-a-virus-encephalitis">influenza A virus encephalitis</a></li>
- +<li><a href="/articles/rabies-encephalitis">rabies encephalitis</a></li>
- +</ul>
- +</li>
- +<li>
- +<a href="/articles/neurosyphilis">neurosyphilis</a> <sup>7</sup>
- +</li>
- +</ul>
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