Now a myelomeningocele is typically associated with a condition called an Arnold Chiari II malformation, which is where cerebellar and brainstem tissue slip down into the foramen magnum, the opening at the base of the skull.

脊髓脊膜膨出通常与小脑扁桃体下疝（Arnold–Chiari）畸形Ⅱ型有关，即小脑和脑干组织从颅腔底部的枕骨大孔疝出。