PMC3994690_01
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
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F1
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].