Localization And Neurologic Examination Practice Test

A 55-year-old woman is evaluated for new-onset neurologic deficits. Physical examination reveals weakness of the right lower face, arm, and leg. She has a loss of proprioception and vibration sense in the right arm and leg. She has a loss of pain and temperature sensation in the left arm and leg. Which of the following is the most likely location of the lesion?

A 68-year-old man with a history of hypertension and type 2 diabetes mellitus is brought to the emergency department after his wife noted a sudden onset of neurologic symptoms. On examination, he has a drooped left eyelid and his left eye is deviated down and out. His left pupil is dilated and nonreactive to light. He also has weakness of his right arm and right leg. Sensation is intact throughout. Which of the following is the most likely location of the lesion responsible for his symptoms?