17-year-old previously healthy female was involved in a pedestrian versus motor vehicle accident. She presented to the hospital with a reduced level of consciousness (GCS 6/15), seizure, and left-sided non-reactive pupil dilation. Her head imaging studies (CT and MRI) identified evidence of diffuse axonal injury involving the left-sided cerebrum, cerebellum and brainstem. There was no finding of restricted diffusion to indicate focal acute ischemic change, mass effect, midline shift or herniation. No injury to orbits or eyes was identified. Her brain injury was managed conservatively without surgical intervention. Approximately 6 weeks post the injury this patient was admitted to our Acquired Brain Injury Rehabilitation Community Reintegration Unit. Physical examination on admission did not reveal focal neurological deficit other than a left-sided incomplete ptosis and mydriasis with sluggish light reflex and diplopia. Additionally, the patient has developed weakness of the right upper and lower limb. Using the presentation above draw the location of the single smallest lesion that could account for all of the above symptoms. Remember to label the sides of your drawing (right/ left) and include labeling of all necessary structures ( and their associated s/s) and the level of the brainstem or spinal cord (rostral pons, caudal medulla, C5 spinal cord, etc.). If the previous pt developed the above s/s due to a traumatic hemorrhage which vessel would be responsible for the condition? What is the name of this condition?

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