A patient suddenly loses the ability to move the right side…

A patient suddenly loses the ability to move the right side of their body. They are rushed to the hospital, and a brain scan (CT scan) is done 2 hours later. The scan shows that a deep part of the brain (the lentiform nucleus) looks blurry, and the clear line that usually separates the outer ribbon of the brain from the inside is fading away. They have slurred speech, difficulty on one side, and their arm is drawn up. What major medical emergency do these early changes point to?