Study of high-altitude cerebral edema using multimodal imaging

Area of Science:

• Radiology
• Neurology
• Altitude Medicine

Background:

• High-altitude cerebral edema (HACE) is a severe form of acute mountain sickness.
• Accurate diagnosis and understanding of HACE injury patterns are crucial for patient management.

Purpose of the Study:

• To compare the diagnostic capabilities of computed tomography (CT) and multi-sequence magnetic resonance imaging (MRI) for HACE.
• To characterize the brain imaging features and injury patterns associated with HACE.

Main Methods:

• Retrospective analysis of 30 HACE patients and 60 control subjects.
• Head CT and multi-sequence MRI (T1WI, T2WI, FLAIR, DWI) were performed on all participants.
• Susceptibility-weighted imaging (SWI) was used in nine HACE patients.

Main Results:

• MRI demonstrated 100% sensitivity and specificity for HACE, significantly outperforming CT (23.3% sensitivity, 100% specificity).
• Severe HACE exhibited significantly larger white matter edema distribution in deep, juxtacortical regions, and the corpus callosum compared to mild HACE.
• Diffusion-weighted imaging (DWI) showed higher signal intensity in both mild and severe HACE, and SWI identified cerebral microbleeds (CMBs) in severe cases.

Conclusions:

• MRI, particularly using the DWI sequence, is more advantageous than CT for evaluating HACE.
• Severe HACE is associated with more extensive white matter injury, especially involving the corpus callosum, and may present with CMBs and corticospinal tract edema.