Neuroblastoma. Pre-stem cell transplant workup. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The cerebellar tonsils are elongated, peg-shaped and extend up to 9 mm below the level of foramen magnum, compatible with Chiari I malformation. There is mild-moderate crowding at this level. There is no ventricular dilatation. Otherwise, the brain parenchyma and pituitary gland appear unremarkable. Specifically, the questions abnormality on recent CT is not appreciated. Myelination is appropriate for age. There is no abnormal intracranial enhancement. There is no midline shift. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
Normal brain MRI without brain metastasis.No definite pituitary abnormality, although please correlate with serum hormone levels, and if clinically indicated, dedicated MR of the pituitary gland can be obtained.Incidental finding of Chiari I malformation.