Lesion in pituitary and possible Chiari malformation: yearly follow up. Pituitary: There is an unchanged hypoenhancing lesion in the left lobe of the pituitary gland, measuring up to approximately 4 mm. The posterior pituitary bright spot and infundibulum are intact. The optic apparatus and cavernous sinuses are unremarkable. Brain: The cerebellar tonsils are minimally low-lying, but conserve rounded morphologies. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma appears unremarkable. There is no abnormal intracranial enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
1. No appreciable change in the left pituitary lesion, which likely represents a microadenoma.2. The cerebellar tonsils are minimally low-lying, but conserve rounded morphologies.