History of medulloblastoma treated with surgery, chemotherapy, and radiotherapy. Since the previous examination, the patient underwent right cochlear implantation. The safety of the MR procedure was verified by ENT prior to the examination. The artifact induced by the cochlear implant is substantial and obscures a large part of the right head posteriorly, including the cerebellar treatment bed at midline in the posterior fossa. Otherwise, the brain and meninges show no abnormal contrast enhancement. The left frontal ventriculostomy tract has not changed nor the chronic lacunar infarct in the corona radiata just lateral to the head of the left caudate nucleus. Ventricles remain mildly dilated, reflecting volume loss. Extensive scattered susceptibility on the previous examination is obscured by the artifact. There is no midline shift or herniation. A small CSF collection at the suboccipital craniectomy site is new likely representing a pseudomeningocele. There is mild right maxillary mucosal thickening without fluid. The imaged paranasal sinuses are clear otherwise. A left eyelid weight produces local susceptibility artifact.
1.The examination is markedly limited by artifact related to cochlear implant with complete obscuration of the resection bed. 2.Where evaluable, no significant intracranial changes are seen.