PMC5701578_01
A) Axial T1-weighted MRI shows intra- and extra-axial tumor in the bilateral CPA and right cerebellar hemisphere. B) Axial ADC demonstrates strong restricted diffusion on the tumor (arrows). C, D) Coronal T2-weighted and sagittal MRI shows mass effect of the tumor in the right CPA
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The lesion on the right CPA side measured 17 x 14 x 18 mm; the lesion on the left CPA side was smaller, measuring approximately 13 x 13 x 9 mm (Fig. 1).
A, B) Pathological characteristics of medulloblastoma showing carrot-shaped cell with monomorphic hyperchromatic nuclei and Homer Wright rosette appearance. C, D) Immunohistochemical analysis. Positive Ki-67 (C) and synaptophysin (D) staining of tumor cells
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The Ki-67 proliferation index was less than 40% (Fig. 2).