12-year-old female with history of medulloblastoma status post craniotomy, chemotherapy and radiation therapy. MRI Brain: This study is again limited by artifact related to dental hardware and the post-contrast images are also limited by motion. Within these limitations, there are unchanged findings related to prior surgery and treatment within the posterior fossa. The tumor resection bed, and associated encephalomalacia of the cerebellar hemispheres, are stable in appearance. A small area of enhancement measuring 6 x 4 mm along the right margin of the fourth ventricle is grossly unchanged. There is no new suspicious enhancement.Elsewhere in the brain, encephalomalacia affecting the right occipital lobe is unchanged and there are no new foci of pathologic enhancement. The numerous foci of susceptibility artifact within the brain parenchyma and along the ventricular margins are not significantly changed. Ventricles are unchanged.MRI Complete Spine: Spinal cord morphology and signal characteristics are within normal limits. There is no pathologic intrathecal contrast enhancement but the cervical spine is partially obscured by artifact on the postcontrast images.Fatty marrow replacement at some levels of the spine is compatible with prior radiation therapy. There is no suspicious marrow signal abnormality, otherwise.Spinal alignment is anatomic, coming for cervical and lumbar straightening which can be related to patient position. Vertebral body heights and morphology are within normal limits. There is no spinal canal or neuroforaminal stenosis.
1.The exam is limited by artifact related to dental hardware and the post-contrast brain sequences are also limited by motion.2.Within these limitations, the posttreatment findings in the posterior fossa remain unchanged without sign of local recurrence. Minimal contrast enhancement along the right lateral fourth ventricular wall is unchanged since May 2014.3.Spinal imaging is notable for radiation treatment findings in the marrow but no sign of metastasis is seen. 