This slide shows a sagittal section of the brain and spinal cord. The brain shows multiple deformities of the brainstem and cerebellum including #1tonsillar herniation, #2 elongation of the 4^th ventricle, #3 beaking of the quadrigeminal plate and #4 elongation of the pons and medulla.There is an indentation of the brainstem and the cerebellum in the location of the foramen magnum . The lower portion of the spinal cord is attached to the sacral bone and shows also a piece of skin attached to a sac that contains meninges and roots of the lumbosacral cord. Diagnosis #1-3: Chiari malformation. #4 Sacral meningomyelocele.