Fig. 4.

A pilocytic astrocytoma of the right cerebellar hemisphere incidentally discovered during staging in a 45-year-old woman with breast cancer. a An axial CT image shows a well-marginated cyst in the right cerebellar hemisphere (arrow). b An axial CT image in a higher level shows fleck-like calcifications (arrowheads). On sagittal T2-weighted (c), coronal FLAIR (d), and axial diffusion-weighted (e) images, the cyst follows cerebrospinal fluid intensity (arrows). This axial post-contrast T1-weighted image (f) depicts an enhancing focus (arrow). On MRS centred on an enhancing nodule with TE 144-ms (g, h), there is mild elevation of choline/Cr, mild reduction of NAA/Cr, and a small lactate peak