Magnetic resonance imaging fingerprints of status epilepticus: A case-control study

Area of Science:

• Neurology
• Radiology
• Neuroimaging

Background:

• Status epilepticus (SE) often presents with peri-ictal magnetic resonance imaging (MRI) abnormalities (PMA).
• The precise anatomical distribution of these MRI changes in SE has not been systematically investigated.
• Understanding these patterns is crucial for accurate diagnosis and management of SE.

Purpose of the Study:

• To systematically assess the localization patterns of diffusion-restricted PMA in patients experiencing SE.
• To compare these patterns with diffusion-restricted lesions from other neurological conditions.
• To determine the diagnostic value of specific PMA locations for SE.

Main Methods:

• A prospective case-control study design was employed.
• MRI, including diffusion-weighted imaging, was performed on 51 patients with SE and 150 controls.
• The distribution and combination of diffusion-restricted PMA were analyzed and compared between groups, with SE patients imaged within 48 hours of onset.

Main Results:

• The most frequent PMA locations in SE were the cortex (49%), hippocampus (39%), and pulvinar of the thalamus (20%).
• In controls, cortex (53%), white matter (35%), and basal ganglia (22%) were most affected; pulvinar of the thalamus was never involved, and hippocampus involvement was rare (5%).
• Involvement of the pulvinar of the thalamus (100% specificity) and hippocampus (95% specificity) showed high diagnostic value for SE, despite low sensitivity.

Conclusions:

• Diffusion-restricted MRI lesions in the pulvinar of the thalamus and hippocampus are strongly associated with SE.
• These specific MRI findings can assist clinicians in diagnosing SE-related changes, particularly in acute settings with unclear clinical or electroencephalographic data.
• The high specificity of these lesions underscores their utility in confirming SE diagnoses.