Lung cancer and head and neck cancer, for staging. There is no evidence of intracranial mass, edema, hemorrhage, or acute infarct. There is a mildly expanded and partially empty sella. There is inferior extension of cerebellar tonsils, up to 10 mm inferior to the foramen magnum. However, the tonsils maintain a normal rounded morphology. The ventricles are normal in size and configuration. The orbits and skull are grossly unremarkable.
1. No evidence of intracranial metastases.2. Partially empty sella and low-lying cerebellar tonsils, which can be manifestations of pseudotumor cerebri.3. Asymmetric enhancement in the right temporomandibular joint may represent synovitis or an anatomic variant. 