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T2-weighted magnetic resonance imaging in the axial plane. Panel a shows preoperative imaging of a medulloblastoma with perifocal edema extending into the right middle cerebellar peduncle (red box) and right dentate nucleus (red arrow). Panel b demonstrates right-sided hypertrophic olivary degeneration (red arrow) occurring 5 months after medulloblastoma resection as a morphological correlate of postoperative cerebellar mutism
