nervous system AE dandy-walker syndrome AE 10048411 http://en.volupedia.org/wiki/Dandy%E2%80%93Walker_malformation dandy-walker综合症 This is an AE which is a rare congenital brain malformation in which the part joining the two hemispheres of the cerebellum (the cerebellar vermis) does not fully form, and the fourth ventricle and space behind the cerebellum (the posterior fossa) are enlarged with cerebrospinal fluid. QY, JX, HY