The deadline for submission of answers is midnight on the day before this case is to be discussed in class. After the class discussion, the feedback link at the end of the page will be activated. Upon arising, he was unsteady, feeling drawn toward the left. He was brought to the emergency room. You find that he has normal vital signs, and he is alert and oriented, with normal memory, language, and visuospatial function.
Visual fields are normal to confrontation.
He has slight right ptosis, and the right pupil is smaller than the left, the asymmetry being especially noticeable in dim light. Extraocular movements are full, but there is horizontal nystagmus with the fast component to the left. Sensation to pin and temperature are diminished on the right side of the face. Facial movement and strength are symmetrical. Hearing is intact.