Male, 12 years old, with headache. The cerebral and cerebellar hemispheres and brainstem show normal signal intensity and morphology. In particular, the cerebellum is morphologically unremarkable with no areas of signal abnormality. The cerebellar tonsils terminate above the level of the foramen magnum. No restricted diffusion is seen. No evidence of parenchymal edema, mass, or mass effect is seen. There is no evidence of intracranial hemorrhage or abnormal extra-axial fluid. The ventricular system is normal in caliber and morphology. Signal intensity of the bone marrow is unremarkable. No significant abnormalities of the paranasal sinuses are detected. The major intracranial vascular flow voids are identified indicating patency.
No acute intracranial abnormality or other specific finding to account for the patient's headaches.