Arnold-Chiari malformation

Abstract

A case of a 14-year-old girl suffering from intense headaches is presented. At the first pediatrician's examination, the patient had regular findings. Prolonged P100 wave latencies were found by testing the visual evoked potentials. After further examination following repeated headaches, Arnold Chiari type I malformation was diagnosed. Arnold Chiari malformation is classified as downward displacement of one or both cerebellar tonsils through foramen magnum. The most common symptom is occipital or suboccipital headaches that usually happens after hard physical effort. Changes in visual evoked potential latencies can be present before other clinical symptoms and can be a useful tool in the diagnostics of headaches in children and adolescents.

Incidental Chiari 1 Malformation - Yet Another Intra-Operative Cause for Bradycardia: A Case Report

“…Chiari type 1 is the least severe of the Chiari malformations and often found incidentally [1,2]. It is the most common type and occurs in a proximately 0.5-3.5% of the general population.…”

“…Under-development of the skull bones and reduced volume of the posterior fossa leads to displacement of the cerebellar tonsils through the foramen magnum. Most patients with Chiari 1 may be asymptomatic or may present with non-specific symptoms [1,2]. Excessive flexion or extension of the head can cause further descent of the brainstem and there can be bony compression [3].…”

“…Chiari 1 malformation is the least severe form characterized by a caudal descent of the cerebellar tonsils through the foramen magnum [1]. Most patients are asymptomatic and the tonsillar descent is incidentally picked up on imaging [1,2]. We report a case of a 13-year-old boy with incidentally detected Chiari 1 malformation who developed significant bradycardia under general anesthesia.…”