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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 26:2027-2029, September 2005
© 2005 American Society of Neuroradiology

Case Report
BRAIN

The Hypodense Artery Sign

Thomas C. Lee^a, Eric S. Bartlett^a, Allan J. Fox^a and Sean P. Symons^a

^a Division of Neuroradiology, Department of Medical Imaging, Sunnybrook and Women’s College Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada

Address correspondence to Sean P. Symons, Division of Neuroradiology, Department of Medical Imaging, AG46, Sunnybrook and Women’s College Health Sciences Centre, Toronto, Ontario M4N 3M5, Canada

Summary: An acute intracranial embolus may be associated with a hyperdense artery sign on CT, related to acute thrombus within the affected artery, a phenomenon that is well known and has been extensively documented. We present an unusual case of a middle cerebral artery territory acute infarct with a hypodense artery on CT. The Hounsfield unit attenuation of the embolic lesion was fat density. CT angiography and MR imaging confirmed the fatty lesion to be within the middle cerebral artery.

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