All of the following are true about Arnold-Chiari malformation except:
Arnold-Chiari Malformation Type I Chiari malformation Type II Chiari malformation - Displacement of cerebellar tonsil into cervical canal - Associated with syringomyelia of cervical canal - Typically produces symptoms during adolescence or adult life - Not associated withhydrocephalus - Patients complain of recurrent headache, neck pain, urinary frequency, and progressive lower extremity spasticity - Lesion represents an anomaly of the hindbrain - Characterized by elongation of the 4th ventricle and kinking of the brainstem, with displacement of the inferior vermis, pons and medulla into the cervical canal. - Type II Chiari malformation is characterized by progressive hydrocephalus with a myelomeningocele. - Plain skull radiographs show a small posterior fossa and a widened cervical canalQ. - CT scanning with contrast and MRI display the cerebellar tonsils protruding downward into the cervical canal and the hindbrain abnormalities. - The anomaly is treated by surgical Decompression
Type I Chiari malformation is displacement of cerebellar tonsil into cervical canal
Type II Chiari malformation is associated with syringomyelia of cervical canal
Type II Chiari malformation is characterized by elongation of the 4th ventricle and kinking of the brainstem, with displacement of the inferior vermis, pons, and medulla into the cervical canal
Type I Chiari malformation is not associated with hydrocephalus
Cerebrovascular Diseases