Brain infarcts in the arterial border zones: Clinical-pathologic correlations

Area of Science:

• Neurology
• Cerebrovascular Diseases
• Neuroscience

Background:

• Most brain infarcts result from arterial occlusion.
• Nonocclusive causes of brain infarcts are less understood but clinically significant.
• Hemodynamic crises, often cardiac in origin, are a key nonocclusive cause.

Purpose of the Study:

• To review mechanisms and clinical presentations of brain infarcts from nonocclusive causes.
• To elucidate the pathophysiology of arterial border-zone infarcts.
• To describe associated neurologic syndromes.

Main Methods:

• Review of selected publications on nonocclusive brain infarcts.
• Analysis of mechanisms and clinical expressions.
• Correlation of infarct distribution with neurologic syndromes.

Main Results:

• Hemodynamic crises are a primary cause of arterial border-zone infarcts.
• Three distinct neurologic syndromes are associated with these infarcts.
• The "man-in-a-barrel" syndrome results from bilateral anterior border-zone infarcts affecting proximal limb muscles.

Conclusions:

• Nonocclusive factors, especially hemodynamic instability, are critical in brain infarct etiology.
• Arterial border-zone infarcts present with specific, identifiable neurologic syndromes.
• Understanding these syndromes aids in diagnosing and managing nonocclusive cerebrovascular events.