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Abnormal superior profile of the midbrain in progressive supranuclear palsy. Top row: midsagittal T1-weighted spin-echo sections in Parkinson disease (A) and PSP (B and C) show the midbrain region. Bottom row: images with outlined profiles of the upper midbrain, which appears convex in A, linear (flat) in B, and concave in C as a result of midbrain atrophy in PSP.30
