Hyperdense MCA sign. Noncontrast axial CT scans (A, B) of the brain in a patient with sudden-onset right hemiparesis show hyperattenuation of the left middle cerebral artery (arrows). This is suggestive of occlusion of the artery. This is one of the signs of acute stroke but does not necessarily represent infarction
Chavhan GB, Shroff MM. Twenty classic signs in neuroradiology: A pictorial essay. Indian J Radiol Imaging. 2009 Apr-Jun;19(2):135-45. doi: 10.4103/0971-3026.50835. PMID: 19881070; PMCID: PMC2765171.