What is signs of arnold chiari?

Arnold-Chiari. A-c is a malformation of the brain consisting of a downward displacement of the cerebellar tonsils through the opening at the base of the skull, sometimes causing non-communicating hydrocephalus as a result of obstruction of cerebrospinal fluid (CSF) outflow. It can cause headaches, fatigue, facial muscle weakness , difficulty swallowing, dizziness, nausea, incoordination, and paralysis.