A 58-year-old man presents with sudden weakness on the right side of the face. He cannot close his right eye or smile symmetrically. Forehead movement is also affected. Other limbs are normal.

A 70-year-old woman developed sudden weakness on the right side of the body and slurred speech. Facial droop spares the forehead. Reflexes on the right are brisk, with an upgoing plantar response.

A 45-year-old man has difficulty walking straight, poor coordination and fail rapid hand movement, and tremor when reaching for objects. Speech is slow. No weakness.

A 62-year-old woman cannot see objects in her right visual field of both eyes. Pupillary light reflex intact.