We report on a child with a metastasising medulloblastoma which was assesse
d by MR diffusion imaging and H-1 MR spectroscopy (MRS). Reduced mean appar
ent diffusion coefficients and a high amount of taurine could be demonstrat
ed. This is the first reported case of high taurine in medulloblastoma in v
ivo and confirms earlier in vivo findings. It is suggested that the changes
on diffusion imaging, possibly reflecting the small-cell histology of the
tumour and high taurine in MRS, are indicative of medulloblastoma.