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Figure 1: Noncontrast CT scan (a) shows a well-defined, intra-axial, hyperattenuating midline cerebellar lesion. On MRI, the lesion is T1 hyperintense (b), T2 markedly hypointense (c), not restricting on diffusion sequence (d) and nonenhancing (e). A mural nodule (arrow) of mixed signal intensity is evident on T2-weighted section (f) and shows faint contrast uptake (g). Sagittal cut (h) shows the lesion and osseous anomalies such as assimilated C1 arch and cervical block vertebrae; tonsillar herniation is also noted

Figure 1: Noncontrast CT scan (a) shows a well-defined, intra-axial, hyperattenuating midline cerebellar lesion. On MRI, the lesion is T1 hyperintense (b), T2 markedly hypointense (c), not restricting on diffusion sequence (d) and nonenhancing (e). A mural nodule (arrow) of mixed signal intensity is evident on T2-weighted section (f) and shows faint contrast uptake (g). Sagittal cut (h) shows the lesion and osseous anomalies such as assimilated C1 arch and cervical block vertebrae; tonsillar herniation is also noted