 The ventricles and sulci are within normal limits. The cisterns remain patent. There is no midline shift or mass effect. There are no areas of abnormal signal or pathological enhancement. There is no diffusion abnormality. No extra-axial fluid collection is identified.Normal flow-voids are demonstrated in the major intracranial vascular structures. The right cerebellar tonsil is slightly low-lying, extending 5 mm below the level the foramen magnum. However, there is no crowding of structures at this level and the cerebellar tonsils remain rounded. Otherwise, the midline structures are within normal limits. There are scattered mucosal thickening in the ethmoid sinuses.
No MR evidence of demyelinating disease. No evidence of traumatic brain injury. Very minimal incidental right cerebellar tonsillar ectopia