Subacute PICA infarct

There is abnormal high signal intensity on T2- and diffusion-weighted axial scans in the left PICA territory. The ADC map however does not demonstrate restricted diffusion, thus identifying the findings on DWI to represent “T2 shine through”. The absence of a true diffusion change dates the infarct to be more than 1 week old, thus late subacute in time frame.

Subacute PICA infarction

Part of the on-line supplement to Neuroradiology – The Essentials with MR and CT (© 2015)