Your father has a condition called a stroke, which is of two types. One is an ischemic stroke, caused by a clot, and the other is a hemorrhagic stroke, which involves bleeding in the brain. There are several causes of stroke, including hypertension, diabetes, smoking, alcohol consumption, and high blood cholesterol or lipids. You did not mention your father’s age or lifestyle.

Based on what you described, if the MRI suggests a clot, it indicates an acute stroke. This means a clot has formed in the brain, which can lead to paralysis on one side of the body, such as the arm and leg on the right side. This condition requires emergency treatment. A clot-dissolving injection must be administered within four and a half hours. If treatment is delayed beyond this window, the injection may not be effective, and other supportive care, such as oxygen and medications, will be required.

If treatment is delayed, regular physiotherapy will be essential. With consistent therapy over three months, your father could gradually improve by up to 90%. Your support and care will be crucial in his recovery.