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Medicine

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Neurology

Question
14 out of 18
 

Most common cause of epidemic viral encephalitis?



A HSV-1
B Arbovirus

C Enterovirus
D None of the above

Ans. B

Arbovirus

ENCEPHALITIS

Viruses causing encephalitis.

1). The most common cause of sporadic viral encephalitis

HSV-I

2). The most common cause of epidemic viral encephalitis

Arbovirus

3). The most common cause of viral meningitis is

Enterovirus

Extra Edge:

1). Japanese encephalitis virus is an arbovirus and is one of the most common causes of encephalitis outbreaks.

2). Nipah virus: is a new member of the Paramyxa virus family.

3). HSV type 2 is a common cause of aseptic meningitis but it is not a cause of encephalitis

4). Focal findings in a patient with encephalitis should always raise the possibility of HSV encephalitis

(Ref. Hari 17th /2631) (Ref. Hari 18th /3415, 1458)

Clinical manifestations common to all viral encephalitis

1). Fever,· Altered consciousness/ confusional state, Headache

2). Focal findings

a. Focal seizures

b. Focal deficit (weakness)

c. Frontoparietal hyper intense lesion on MRI

Examples of focal findings include:

MRI

Areas of increased signal intensity in the frontotemporal, cingulate or insular region of brain on MRI

CT

Temporoparietal areas of low absorption, mass effect and contrast enhancement

EEG

Periodic temporal lobe spikes on a background of slow or low amplitude activity on EEG

Extra Edge:

MRI findings in other condition

Conditions

MRI findings

Neurocysticercosis

Multiple cystic lesions with enhancement of MRI

Acute pyogenic meningitis

Diffuse meningeal enhancement on MRI

Carcinoma meningitis

Nodular tumor deposits in the meninges or diffuse meningeal enhancement on MRI

Neurology Flashcard List

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