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FIGURE 208-1

FIGURE 208-2

FIGURE 208-3

FIGURE 208-4

FINDINGS Figure 208-1. The initial imaging study was a head sonogram. This shows a large hyperechoic mass in the posterior fossa (arrows). Figure 208-2. Axial NCCT through the posterior fossa. The mass is hyperdense and well circumscribed (arrows). There is hydrocephalus with transependymal cerebrospinal fluid (CSF) flow (vertical arrows). Figure 208-3. Axial T2WI through the posterior fossa. The mass is heterogeneously hypointense with mild surrounding hyperintensity—edema (arrows). Figure 208-4. Sagittal post-contrast T1WI. The mass shows mild patchy enhancement (arrows). There is compression of the brainstem.

DIFFERENTIAL DIAGNOSIS

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