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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

Published on: August 14, 2019

Diffusion-weighted imaging in acute hyperammonemic encephalopathy.

Michael Rosario¹, Kevin McMahon, Pasquale F Finelli

¹Department of Neurology, University of Connecticut, Hartford Hospital, Hartford, Connecticut, CT, USA.

The Neurohospitalist

|October 30, 2013

Summary

This summary is machine-generated.

Acute hepatic encephalopathy shows distinct magnetic resonance imaging (MRI) changes, including restricted diffusion in specific brain regions. These findings differ from chronic liver disease patterns and can be mistaken for hypoxic-ischemic injury.

Keywords:

MRI acute hyperammonemic encephalopathy diffusion-weighted imaging liver disease

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Last Updated: May 6, 2026

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Area of Science:

Neurology
Radiology
Hepatology

Background:

Chronic liver disease (CLD) is associated with specific MRI findings like cerebral atrophy and globus pallidus hyperintensities.
Acute hepatic encephalopathy (AHE) presents with distinct MRI changes that can be confused with hypoxic-ischemic injury.
Limited description of AHE's neuroimaging in the literature poses diagnostic challenges.

Purpose of the Study:

To describe the characteristic MRI findings in acute hyperammonemic encephalopathy.
To differentiate AHE imaging patterns from those of CLD and hypoxic-ischemic injury.
To enhance the understanding of AHE's neuroimaging in clinical practice.

Main Methods:

Case series of three patients with acute hyperammonemic encephalopathy.
Detailed analysis of magnetic resonance imaging (MRI) findings, including T1-weighted, T2-weighted, and diffusion-weighted images.
Correlation of imaging findings with clinical presentation and laboratory results.

Main Results:

Acute hyperammonemic encephalopathy demonstrated restricted diffusion in the insular and cingulate cortices and bilateral thalami.
These diffusion changes were not consistently observed on T2-weighted images.
Findings were distinct from typical chronic liver disease-related MRI changes.

Conclusions:

Acute hyperammonemic encephalopathy has a characteristic MRI pattern of restricted diffusion in specific brain areas.
Recognizing these distinct MRI findings is crucial to avoid misdiagnosis as hypoxic-ischemic injury.
Further research is warranted to fully elucidate the neuroimaging spectrum of AHE.