Female, 36 years old, new onset headaches since 12/28. Improving after LP on 12/30 at outside hospital. Unknown opening pressure. The cerebellar tonsils are ectopic descending 2 to 3 mm below the level of the foramen magnum. The tonsils maintain a round morphology. There is mild CSF effacement at the level of the foramen magnum. A single non specific focus of T2 hyperintensity is seen within the white matter of the left inferior frontal lobe. The cerebral and cerebellar hemispheres and brainstem are otherwise unremarkable. Diffusion-weighted images show no evidence of restricted diffusion.No intracranial hemorrhage, mass, edema or midline shift is noted. No abnormal extra-axial fluid is present. Mild asymmetry in the size of the lateral ventricles is within normal limits. Ventricular caliber and morphology are unremarkable. On postcontrast images, no pathologic parenchymal or extra-axial enhancement is detected.
1. Cerebellar tonsillar ectopia is of uncertain significance relative to the patient's presenting complaint.2. No other specific findings are seen which would account for the patient's symptoms. 