FIG 8. On fast STIR images, volume loss in the SN was not evident in patients with Parkinson disease. On T2-weighted images, thinning of the relatively hyperintense structure (arrow in C) was not evident in patients with Parkinson disease.

A–C, Images in a patient with Parkinson disease, a 52-year-old woman. Oblique coronal fast STIR images through the level of the posterior commissure (A) and superior colliculus (B) and axial T2-weighted image (C).

D–F, Corresponding images in a control subject, a 55-year-old woman.