Sahbai, S, Kauv, P, Abrivard, M et al. · European journal of nuclear medicine and molecular imaging · 2019 · DOI
This study examined a single ME/CFS patient's brain using advanced imaging technology (PET/MRI) that can show both brain activity and blood flow simultaneously. The researchers found that certain areas in the back of the patient's brain showed significantly lower metabolic activity (meaning cells were using less energy), but blood flow to those same areas appeared normal. This unusual pattern suggests that ME/CFS may involve a specific type of brain dysfunction that current standard brain scans might miss.
This study demonstrates that ME/CFS may involve detectable brain metabolic abnormalities that are not simply explained by reduced blood flow, supporting the biological basis of the disease. The finding encourages further investigation of metabolic dysfunction as a potential mechanism in ME/CFS and suggests that advanced imaging techniques may help identify objective biomarkers for diagnosis and disease monitoring.
This single case report cannot establish that all ME/CFS patients have this imaging pattern or that posterior hypometabolism is a universal characteristic of the disease. The study also does not prove causation—finding metabolic changes does not explain what causes them or whether they directly cause the patient's symptoms. Additionally, without a comparison group, it cannot determine whether these findings are specific to ME/CFS or occur in other conditions.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Sahbai, S, Kauv, P, Abrivard, M, Blanc-Durand, P, Aoun-Sebati, M, Emsen, B, et al. (2019). Severe posterior hypometabolism but normal perfusion in a patient with chronic fatigue syndrome/myalgic encephalomyelitis revealed by PET/MRI.. European journal of nuclear medicine and molecular imaging. https://doi.org/10.1007/s00259-018-4229-3
BibTeX
@article{mecfsatlas-sahbai-2019-severe-posterior,
author = {Sahbai, S and Kauv, P and Abrivard, M and Blanc-Durand, P and Aoun-Sebati, M and Emsen, B and Luciani, A and Hodel, J and Authier, F-J and Itti, E},
title = {Severe posterior hypometabolism but normal perfusion in a patient with chronic fatigue syndrome/myalgic encephalomyelitis revealed by PET/MRI.},
journal = {European journal of nuclear medicine and molecular imaging},
year = {2019},
doi = {10.1007/s00259-018-4229-3},
note = {PubMed: 30552447},
url = {https://www.mecfsatlas.com/evidence/sahbai-2019-severe-posterior},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/sahbai-2019-severe-posterior
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