For a brief of review of the neuroanatomy of the brain in this region, refer to the diagram at any time. The anterior horns and the posterior horns are shown in this diagram. The corticospinal tract originates from the motor strip of the cerebral cortex. The fibers collect as they traverse through the posterior limb of internal capsule. The tract largely crosses the midline in the decussation of the pyramids.
Fibers exit the spinal cord at their respective levels.
View our patient's CT scan. The image on the left is without contrast. The same cut is shown on the right with contrast. The patient's right is to the left of the image as marked. There is a hypodense region in the left posterior basal ganglia.