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A 4 year-old boy presented with headaches, vomiting and an unsteady gait.
(Left) T2-axial; (Middle) T1-axial; (Right) T1-axial with gadolinium. Note the large enhancing mass invading the roof of the fourth ventricle. Compression of the fourth ventricle then resulted in non-communicating hydrocephalus (best seen on the Flair image). Surgical decompression showed the mass to be a medulloblastoma.
Revised
05/16/06.
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School of Medicine.