Figure 7a. Type III VR space in a 25-year-old man. (a) Axial proton-density–weighted image (2620/100) shows a hyperintense spot in the brainstem (arrow). (b) Axial FLAIR image (7292/120) obtained at the same level shows that the spot has CSF-like content without abnormal surrounding signal intensity (arrow). These findings confirm that the spot is a VR space.