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Case 2. A, Axial TSE T2 image through the posterior fossa shows left cerebellar hypoplasia and enlargement of the bilateral cerebellomedullary cistern without any evidence of membrane at the fourth ventricle exit foramina. B, Axial oblique reformatted image of sagittal 3D-CISS reveals obstructing membranes of foramina of Luschka, bulging into the cerebellomedullary cisterns.
