The Insular Ribbon Sign
PCA Territory loss of Grey White - Look out For
PCA territory infarct can be subtle on non-contrast CT of the head. Make sure you look in this vascular territory and strutinize the grey white differentiation in all vascular territories, including the PCA and the ACA.
Calcified Emboli - Imaging Sign
Look for small calcific emboli with the vessels. These could be acute or chronic but are suggestive of proximal embolic source, such as a ruptured calcified plaque.
Hemorrhagic Transformation in an Infarcted Region
Susceptability sequences SWI show diffuse hemmohragic change in an area of infarction correspoiding to DWI restriction.