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An ill defined soft tissue mass is seen centered on the 4th ventricle obliterating its cavity and extends through foramen of Magendi posterior to the pons and medulla oblongata. It squeezes into the aqueduct of sylvius and extends to the 3rd then through foramina of Monro to frontal horns of both lateral ventricles as well as the suprasellar and prepontine cisterns. MRS reveals striking elevation of Cho peak with Cho/Cr ratio of 6.5 with marked reduction of NAA peak and small traces of lipid and lactate.