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FIGURE 222-1

FIGURE 222-2

FIGURE 222-3

FINDINGS Figure 222-1. Sagittal T1 MPRAGE. There is moderate midbrain/tegmental volume loss (vertical arrow), thinned tectal plate (posterior transverse arrow), mild pontine volume loss (flattening of the basis pontis-chevron) known as “hummingbird sign.” Figure 222-2. Axial MPRAGE through the midbrain. There is widening of the interpeduncular cistern (vertical arrow) and concave appearance of the lateral midbrain (transverse arrows). Figure 222-3. Coronal MPRAGE through the brainstem. There is loss of volume of the superior cerebellar peduncle (arrows).

DIFFERENTIAL DIAGNOSIS

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