Which MRI findings are characteristic of the chronic phase (>21 d) of acute stroke?

Updated: Dec 19, 2018
  • Author: Souvik Sen, MD, MPH, MS, FAHA; Chief Editor: Helmi L Lutsep, MD  more...
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In this phase, the edema completely resolves, and the infarcted area still appears as a hypointensity on T1-WI and as a hyperintensity on T2-WI. Because of tissue loss in the infarcted area by this time, ex-vacuo ventricular enlargement and widening of the cortical gyri and fissures take place.

In contrast-enhanced images, parenchymal enhancement typically also persists throughout this phase; it usually disappears by 3-4 months.

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