Tirelli, U, Chierichetti, F, Tavio, M et al. · The American journal of medicine · 1998 · DOI
Researchers used a brain imaging technique called PET scans to measure energy use in the brains of 18 people with ME/CFS. They found that people with ME/CFS had lower energy use in a specific part of the brain (the brainstem) and part of the front of the brain compared to healthy people. Importantly, this pattern was different from what they saw in people with depression, suggesting ME/CFS may have its own distinct brain signature.
This study provides objective neurobiological evidence that ME/CFS involves measurable brain metabolic abnormalities, supporting the biological basis of the illness. The finding of brainstem hypometabolism may offer a potential biomarker for diagnosis, which could help differentiate ME/CFS from psychiatric conditions and advance understanding of its pathophysiology.
This study does not prove that brainstem hypometabolism causes ME/CFS symptoms—it only shows an association. The small sample size and preliminary nature of the findings mean these results cannot yet be used clinically as a diagnostic test. The study also does not explain why this metabolic pattern develops or whether it changes with disease progression or treatment.
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 →
Spotted an error in this entry? Report it →