FIG 3. Images from the case of a 2-year-old patient who presented with symptoms and signs suggestive of a posterior fossa mass.

A, Coronal view contrast-enhanced T1-weighted image shows a large mass centered in the right cerebellar hemisphere that was confirmed to be medulloblastoma. No evidence of intracranial metastases was observed at presentation.

B, Contrast-enhanced FLAIR image obtained at 6 months shows definite abnormality in the meninges overlying the left parietal lobe (arrow).

C, In retrospect, this region is viewed as abnormal on the contrast-enhanced T1-weighted image, although it was reported as normal.

D, Contrast-enhanced T1-weighted image obtained at 12 months shows definite progression.

E, Contrast-enhanced T1-weighted image obtained at 18 months also shows definite progression.