 There is bilateral, nearly symmetric, T2 hyperintensity localized to the anterior aspect of the medulla without restricted diffusion, susceptibility abnormality, or enhancement.The ventricles and sulci are normal in size. The cerebellar tonsils are in normal position. There are no masses, mass effect or midline shift. The pituitary gland is normal in size. There is no evidence for intracranial hemorrhage or acute cerebral, brainstem or cerebellar infarction. No diffusion-weighted abnormalities are identified. There are no extraaxial fluid collections or subdural hematomas. Flow voids are present within the major vessels indicating patency. The paranasal sinuses and mastoid air cells are clear. There is no abnormal enhancement within the brain.
There is bilateral, nearly symmetric, T2 hyperintensity localized to the anterior aspect of the medulla without restricted diffusion, susceptibility abnormality, or enhancement. This is nonspecific in appearance and has been described in entities such as demyelination, infectious/inflammatory processes, hypertrophic olivary degeneration (although there is no definite primary lesion as the source), and subacute combined immunodeficiency.