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Chronic herniation of the hindbrain
Annals of the Royal College of Surgeons of England
|January 1, 1981
Summary
Hindbrain herniation, including Chiari Type I and II deformities, can cause neurological symptoms by acting as a valve. Surgical decompression offers relief for Chiari Type I symptoms and may help manage hydrocephalus in Chiari Type II.
Area of Science:
- Neurology
- Neurosurgery
- Developmental Biology
Background:
- Hindbrain herniation involves the downward displacement of cerebellar and medullary tissues through the foramen magnum.
- This herniation can create a pressure gradient, leading to a 'valvular effect' influencing clinical presentation.
- Chiari Type I deformity involves tonsillar prolapse through a normal foramen magnum, often presenting in adulthood with delayed symptoms.
- Chiari Type II (Arnold-Chiari) deformity is an intrauterine abnormality seen in severe spina bifida, characterized by herniation of the fourth ventricle and medulla with an enlarged foramen magnum.
Purpose of the Study:
- To explain the clinical course of hindbrain herniation, particularly in relation to spina bifida.
- To describe the characteristics and clinical presentations of Chiari Type I and Type II deformities.
- To discuss the efficacy and techniques of surgical decompression for hindbrain herniation.
Main Methods:
- Review of clinical presentations and pathological characteristics of hindbrain herniation.
- Discussion of the proposed valvular mechanism of hindbrain herniation.
- Analysis of surgical outcomes and monitoring techniques for hindbrain herniation.
Main Results:
- Hindbrain herniation acts as a valve, explaining clinical courses in adults and infants with spina bifida.
- Chiari Type I deformity commonly presents with syringomyelia in adulthood, with symptoms like cough headache and syncope.
- Chiari Type II deformity is associated with hydrocephalus progression in spina bifida infants.
- Surgical decompression can alleviate symptoms in Chiari Type I and potentially aid in managing hydrocephalus in Chiari Type II.
Conclusions:
- Hindbrain herniation is a significant factor in the clinical manifestations of Chiari Type I and II deformities.
- Early diagnosis and surgical intervention are crucial for managing symptoms and preventing irreversible damage.
- Pressure monitoring is valuable for assessing disease state and treatment efficacy.