case_images: PMC3994690_01
case_images: T1-weighted sagittal MRI of the brain (left) reveals inferior displacement of the cerebellar tonsils 18 millimetrs below the level of C1 consistent with a Chiari I malformation and and a pear-shaped disproportionately large communicating fourth ventricle. Axial T1-weighted MRI (right), note enlarged fourth ventricle
case_images: SNI-5-17-g001.jpg
case_images: PMC3994690_01_SNI-5-17-g001.jpg
case_images: F1
case_images: Magnetic resonance imaging (MRI) of the brain showed an 18 mm cerebellar tonsillar herniation and a disproportionately large communicating fourth ventricle with dilated but stable ventricular system, and no change from previous studies [Figure 1].