Chiari malformations, types I-IV, refer to a spectrum of congenital hindbrain abnormalities affecting the structural relationships between the cerebellum, brainstem, the upper cervical cord, and the bony cranial base.

History Of The Procedure

Although Cleland described the first cases of Chiari malformation in 1883, the disorder is named after Hans Chiari, an Austrian pathologist, who classified Chiari malformations into types I through III in 1891. Chiari’s colleague, Julius Arnold, made additional contributions to the definition of Chiari II malformation.^[1] In his honor, students of Dr. Arnold later named the type II malformation Arnold-Chiari malformation. Other investigators later added the type IV malformation. … [Continue Reading]