【正文】
mall posterior fossa with herniation of the cerebellar tonsils through the foramen magnum (blue arrows) and a beaked appearance of the tectum (green arrow). There is associated hydrocephalus (red arrow).T2weighted sagittal (Figure 6 and Figure 7) and axial (Figure 8and Figure 9) images of the spine demonstrate a myelomeningocele at the level of the lower lumbar spine (purple arrows).【影像診斷】:Chiari II Malformation 【診斷要點】:Chiari II malformations are plex congenital deformities involving the brainstem and cerebellum with a host of associated developmental abnormalities同時還有多種