Medulloblastoma. Status post resection, chemotherapy and radiotherapy. Off treatment. Brain:The treatment bed in the posterior fossa to the right of midline (involving the posterior medial aspect of the right cerebellar hemisphere) has not changed. It is not associated with suspicious contrast enhancement. The minimal extent of surrounding parenchymal T2/T2 FLAIR hyperintensity has not changed. Otherwise, there is no contrast-enhancing brain lesion. Accounting for mild ex vacuo enlargement in the posterior fossa, the ventricular system is nondilated. Normal flow-voids are present within the major intracranial vascular structures.Moderate mucosal thickening in the maxillary and to a lesser extent the posterior ethmoid and sphenoid sinuses improved since the previous examination.Spine:Spinal alignment is anatomic. The marrow is more fatty than expected for age which probably reflects previous treatment. There is no suspicious marrow lesion. The spinal canal is preserved.The spinal cord shows normal morphology and signal. The tip of the conus medullaris is at the lower L1 level. There is no abnormal spinal or leptomeningeal contrast enhancement.The left renal pelvis and ureter are slightly prominent but not frankly hydronephrotic.
1. Unchanged posttreatment findings without evidence of tumor recurrence within the brain or spine.2. Nonspecific moderate paranasal sinus mucosal thickening is mildly improved since the prior exam.