Cheng, Joseph S, Nash, John, Meyer, Glenn A · The neurologist · 2002 · DOI
Chiari type I is a condition where brain tissue (cerebellar tonsils) extends into the spinal canal, potentially compressing the lower brain and upper spinal cord. This article reviews how doctors diagnose and treat this condition, and discusses possible links between Chiari I and ME/CFS, fibromyalgia, and other neurological symptoms. The authors note that in severe cases, Chiari I can cause permanent nerve damage, but better imaging and treatments are being developed.
This work is important because it acknowledges and discusses potential associations between a documented structural neurological abnormality (Chiari I) and ME/CFS, fibromyalgia, and related conditions that have historically faced diagnostic uncertainty. For ME/CFS patients, understanding whether Chiari I may underlie or contribute to symptoms could open pathways to targeted diagnostic imaging and treatment options. The editorial highlights that structural brain/spinal cord abnormalities warrant serious investigation as potential contributors to ME/CFS symptomatology.
This editorial does not establish causation or quantify the true prevalence of Chiari I in ME/CFS populations—it only notes that associations have been 'proposed.' It does not present original research data proving that Chiari I causes ME/CFS or that treating Chiari I cures ME/CFS. The article is a clinical review, not a controlled comparative study, so it cannot determine whether Chiari I and ME/CFS co-occur by chance, shared etiology, or direct causation.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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Primary citation
Cheng, Joseph S, Nash, John, & Meyer, Glenn A (2002). Chiari type I malformation revisited: diagnosis and treatment.. The neurologist. https://doi.org/10.1097/00127893-200211000-00005
BibTeX
@article{mecfsatlas-cheng-2002-chiari-type,
author = {Cheng, Joseph S and Nash, John and Meyer, Glenn A},
title = {Chiari type I malformation revisited: diagnosis and treatment.},
journal = {The neurologist},
year = {2002},
doi = {10.1097/00127893-200211000-00005},
note = {PubMed: 12801437},
url = {https://www.mecfsatlas.com/evidence/cheng-2002-chiari-type},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/cheng-2002-chiari-type
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