Acute infarct with dense MCA sign

Acute infarct with dense MCA sign. This non-contrast CT shows a wedge-shaped area of low attenuation in the right MCA territory (white arrows), with a focus of increased density in the right middle cerebral artery (yellow arrow). This is the dense MCA sign, and represents thrombus in the artery. When this sign is visible, it tends to be associated with a poorer outcome.