There is infarction or hemorrhage (bleeding) in the internal capsule area of the brain. Which causes hemiparesis in opposite side of the body.

Usually there is hemiparesis on the opposite side of the lesion, as the motor and sensory fibres cross to opposite side of the body. In ipsilateral hemiparesis there is lesion in the region after crossing of fibres has taken place. This is very uncommon.

Hemiparesis is muscle weakness on only one side of the body. When hemiparesis happens as a result of a stroke, it commonly involves muscles in the face, arm, and leg.

Weakness in one half of your body is called as hemiparalysis or hemiparesis. It is usually caused by blood supply related problem to internal capsule of the brain.

on the left side