Arnold–Chiari malformation is associated with increased likelihood of a procedure in idiopathic intracranial hypertension

The presence of Arnold-Chiari malformation in patients with idiopathic intracranial hypertension is associated with an increased likelihood of requiring a procedure. Moreover, independent of procedural outcome, cerebellar tonsillar lowering occurs in IIH patients so frequently that it should be further investigated as a potential neuroradiologic "soft sign" of the disease.