Dense middle cerebral artery sign: a pictorial study.

Area of Science:

• Neurology
• Radiology
• Neuroradiology

Background:

• Computed tomography (CT) is widely available for diagnosing stroke.
• A hyperdense middle cerebral artery (MCA) on CT suggests MCA occlusion.
• This sign alone does not predict the subsequent clinical course or outcomes.

Purpose of the Study:

• To illustrate the diverse radiological findings following MCA occlusion.
• To highlight the heterogeneity of ischemic changes and patient outcomes despite a common CT sign.
• To emphasize the importance of interpreting the hyperdense MCA sign within the context of the entire CT scan.

Main Methods:

• Pictorial study design.
• Inclusion of four prototypic patients presenting with a hyperdense MCA.
• Analysis of radiological findings, vascular disturbances, ischemic changes, and patient outcomes.

Main Results:

• A hyperdense MCA was the common finding across all patients.
• Significant heterogeneity was observed in vascular disturbances, lesion location, extent of ischemia, and final patient outcomes.
• The radiological presentation varied considerably among the studied cases.

Conclusions:

• The hyperdense MCA sign on CT is a marker for occlusion but lacks prognostic value on its own.
• Radiological assessment of MCA occlusion requires evaluation of the entire CT scan, not just isolated findings.
• Patient outcomes following MCA occlusion are highly variable and influenced by factors beyond the initial hyperdense sign.