MCA dot sign

Case contributed by Dr Kwang Chin


Acute left upper and lower limb weakness


MCA "dot" sign (arrow)

Annotated image

Magnified view demonstrating a hyperdense 'dot' in the anterior sylvian fissure. 

Case Discussion

The hyperattenuation of the MCA dot sign represents a thromboembolus within a segmental branch of the MCA located within the sylvian fissure.  The sign appears when the high-attenuation MCA is viewed in cross section, since the occluded vessel courses in a plane perpendicular to the transverse plane of imaging.

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Case information

rID: 11088
Published: 15th Oct 2010
Last edited: 13th Aug 2019
Tag: mca, stroke
Inclusion in quiz mode: Excluded

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