Fig. 4.

Preoperative diagnosis facilitating surgical planning. MRI of a 9-year-old boy with an underlying diagnosis of neurofibromatosis type 2 revealed an infratentorial lesion radiologically consistent with pilocytic astrocytoma or ependymoma. This was diagnosed preoperatively as ependymoma using information from MRS, allowing surgical planning for complete resection. In this case, high myoinositol supported an ependymoma diagnosis, whereas intraoperative histopathology did not confirm the diagnosis. The final histopathological diagnosis confirmed ependymoma.