Mother with history of brain aneurysm. Patient with history of headaches. MRI BRAIN: The cerebellar tonsils extend approximately 19 mm below the level of the foramen magnum. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma appears unremarkable. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The skull and extracranial soft tissues are unremarkable. MRA HEAD: The intracranial internal carotid arteries are normal in course and caliber. The middle and anterior cerebral arteries are unremarkable. The vertebral arteries, basilar artery, and posterior cerebral arteries are normal in course and caliber. There is no evidence of flow-limiting stenosis or aneurysm.
1. Cerebellar tonsils extend 19 mm below the level of the foramen magnum, consistent with Chiari 1 malformation. There is no evidence for ventriculomegaly on this exam.2. No evidence of intracranial hemorrhage, mass, or acute infarct.3. No evidence of intracranial stenosis or aneurysm.