Viral Encephalitis (MR).

Bilateral increased intensity of both Hippocampi on T2 image.

Bilateral decreased intensity of both Hippocampi on T1 image.

PROTOCOL:
T2W – Sagittal & axial scans
T1W – Axial scans
FLAIR – Coronal scans
DW & T2FFE (Gradient) – Axial scans
3D TOF MR angiography of the circle of Willis vessels and MIP reconstruction.

FINDINGS:

Revealed:

-Emergency report.
-Bilateral increased signal intensity of both Hippocampii with loss of internal architecture.
-No abnormal enhancement after contrast injection.
-Normal morphology of the venous system.

-The rest of the brain Parenchyma shows normal grey white matter differentiation and signal intensities.  No focal mass lesion is seen.
-Lateral and third ventricles are normal in size and position. Septum is in midline.  There is no midline shift.
-Basal cisterns, cortical sulci and gyri are normal in appearance.
-Corpus callosum shows normal MR morphology.
-Brain stem and cerebellum show normal signal intensities.
-Fourth ventricle is normal in size and is midline in position.

OPINION:

• Picture is suggestive of viral encephalitis likely Limbic.


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Link for Herpes Simplex Encephalitis