 Brain: There is no intracranial mass or abnormal parenchymal or meningeal enhancement. Brain parenchyma appears within normal limits. Ventricles and sulci are normal. No extra-axial collections. No findings to suggest ischemia or hemorrhage. Incidentally noted is cerebellar tonsillar ectopia with the right cerebellar tonsil measuring up to 7 mm below the foramen magnum.Unchanged small left maxillary mucus retention cyst. Paranasal sinuses and mastoid air cells are otherwise clear. Major flow-voids are preserved.Soft tissues Head/Neck: As seen on recent CT, there are postoperative findings related to right hemimandibulectomy and superficial parotidectomy. There is diffuse atrophy of the right masticator muscles. Enhancement along the right temporalis muscle extending to the overlying scalp is consistent with posttreatment change. There is small area of enhancement measuring approximately 11 x 8 mm involving the deep aspect of the resection bed anterior lateral to the level of the hypoglossal canal which may be related to post treatment change versus minimal residual tumor (series 4 image 15, series 11 image 17). Otherwise no discrete mass to definitively suggest recurrent tumor is appreciated. There are small adjacent lymph nodes as well as elsewhere in the neck which are nonspecific. No pathologically enlarged or necrotic lymph nodes are seen. No discrete masses or evidence of pathologic enhancement elsewhere in the neck. The airway remains patent. Visualized spinal canal appears within normal limits without abnormal masses within the spinal canal or neural foramina appreciated. Paraspinous soft tissues are unremarkable.
1. MRI of the brain demonstrates no intracranial mass or abnormal enhancement to suggest neoplasm. Incidentally seen is ectopia of the cerebellar tonsils with the right cerebellar tonsil measuring up to 7 mm below the foramen magnum. Brain parenchyma is otherwise unremarkable.2. Posttreatment changes in the right masticator space/mandibular region related to prior tumor resection as seen on recent CT studies. There is small focus of nodular enhancement deep to the resection cavity which may represent postsurgical change versus minimal residual tumor. No prior postoperative MRI is available for direct comparison and attention on follow-up is suggested.3. No significant cervical lymphadenopathy or other neck masses.