Feb 15, 2025 · The hyperdense MCA sign, also known as Gács sign, is a type of hyperdense vessel sign and refers to focal hyperattenuation of the middle cerebral artery (MCA) on non-contrast brain CT and is due to intraluminal thromboembolic material.

Jul 20, 2024 · The hyperdense vessel sign is often used synonymously with hyperdense artery sign, which may be appreciated in the setting of hyperacute ischemic stroke, but hyperdense vessel sign may also be used more liberally to refer to a hyperdense cerebral vein or venous sinus in the setting of cerebral venous sinus thrombosis 1.

3 days ago · It should also be noted that middle cerebral artery infarcts are often incomplete affecting only perforator branches or one or more distal branches. As such in many cases, only parts of the middle cerebral artery territory are affected. CT. The earliest finding of middle cerebral artery occlusion is: hyperdense middle cerebral artery sign 3

Hyperattenuation of an intracranial artery on NCCT is an indicator of an occluding clot in acute ischaemic stroke. It was first described in the middle cerebral artery (MCA) by Gács et al in 1983 (2) and is known as the hyperdense MCA sign.

In medicine, the dense artery sign or hyperdense artery sign is an increased radiodensity of an artery as seen on computer tomography (CT) scans, and is a radiologic sign of early ischemic stroke. [1]

Hyperdense middle cerebral artery sign (HMCAS) in patients with a large cerebral infarction without thrombolytic therapy is an independent marker of hemorrhagic transformation (HT). Length of HMCAS is also a marker of HT with lower ALberta Stroke Program Early CT score (ASPECTS) in HMCAS patients.

Nov 15, 2024 · Middle cerebral artery (MCA) dot sign, also known as the Sylvian fissure sign, observed on non-contrast CT of the head, refers to the visualisation of a hyperattenuating dot within the Sylvian fissure (Fig. 28.38). The Sylvian fissure contains the M2 and M3 segments of the MCA, and the visualisation of the dot sign represents thromboembolism ...

Sep 21, 2011 · The “Dense MCA or dense vessel sign” is one of the early signs of acute MCA territory infarction. Corresponds to a hyperdense cord like MCA main stem in the Sylvian fissure on CT. Represents thrombotic material in main stem of the MCA.

Dense MCA sign stands for a hyperdense linear structure located along the course of the middle cerebral artery (MCA), typically in the Sylvian fissure in CT images. The sign may be seen unilaterally (on the affected side) compared to the contralateral MCA, which appears of …

Apr 1, 1999 · The hyperdense middle cerebral artery sign (HMCAS) is a marker of thrombus in the middle cerebral artery (MCA). 1 The specificity of the HMCAS for MCA occlusion approaches 100%, whereas its sensitivity is low.