Figure 1: Sagittal MRI scan demonstrating a pre-operative Chiari malformation with cervical syrinx (left), and the same patient 6 months post-operatively demonstrating resolution of the Chiari malformation as well as almost complete resolution of the syrinx (right). The foramen magnum is represented by the dashed red line. Before surgery the patient’s cerebellar tonsils extended 13mm below the foramen magnum (double arrow-head white line), and the tonsils ‘plug’ the craniocer
