Normal IQ in a 55-year-old with newly diagnosed rhombencephalosynapsis.

Rhombencephalosynapsis (RS) is a rare congenital disorder characterized principally by agenesis/hypogenesis of the cerebellar vermis and fusion of the dentate nuclei and cerebellar hemispheres. Fusion of the peduncles and colliculi is common, and associated anomalies of the cerebral hemispheres also can be present. Only about 50 cases with RS have been described and the majority of these have been children.

Atrial fibrillation is associated with severe acute ischemic stroke.

Atrial fibrillation (AF) is a common risk factor for disabling ischemic stroke in the elderly, but it is not clear that its severity is generally worse than that of ischemic stroke due to other etiologies. We reviewed the clinical presentations of patients with acute ischemic stroke admitted between 1990 and 2001. The etiologies of these strokes were also classified using well-established criteria.