FIG 3. 56-year old man scanned on day 2 after acute onset of vertigo and an intranuclear ophthalmoplegia, suggestive of a midbrain infarct.

A, FSE image reveals a tiny focus of abnormal signal in the right periaqueductal gray matter (arrow).

B and C, FLAIR image (B) and diffusion-weighted image sensitive to flow in the anteroposterior direction (C) are normal. The patient was discharged with a clinical diagnosis of a midbrain infarct and has not had follow-up imaging.