Dickinson, C J · European journal of clinical investigation · 1997 · DOI
Quick Summary
This review examines why ME/CFS develops, looking at evidence from 40 years of research. The author discusses how ME/CFS may involve damage to the brain stem (the oldest part of the brain that controls basic functions like sleep and alertness), possibly from a previous viral infection. Brain imaging studies have found small patches of damage in the brain stems of some ME/CFS patients, similar to what is seen in other conditions like post-polio fatigue.
Why It Matters
This study is important because it offers a neurobiological framework for understanding ME/CFS—proposing brainstem damage rather than purely psychological causes. By drawing parallels to post-polio fatigue syndrome (where similar lesions are well-documented), the author provides a mechanistic rationale for why ME/CFS patients have persistent fatigue and cognitive dysfunction, potentially opening therapeutic avenues.
Observed Findings
MRI studies show small discrete patchy brainstem and subcortical lesions in some CFS patients
SPECT regional blood flow studies consistently reveal reductions in blood flow, especially in the hindbrain
Similar brainstem lesions have been reported in post-polio fatigue syndrome and multiple sclerosis, both characterized by chronic fatigue
Evidence suggests either active viral infection or immunological disorder may be present in CFS
Emotional presentation of symptoms does not negate the possibility of underlying organic pathology
Inferred Conclusions
CFS may result from residual damage to the brainstem's reticular activating system, possibly caused by previous viral infection
Brainstem lesions could explain both the fatigue and cognitive/sleep dysfunction seen in CFS
The presence of similar lesions in post-polio fatigue supports a neurobiological rather than purely psychological etiology
Better identification of brainstem pathology could define therapeutic targets for CFS treatment
Remaining Questions
What proportion of CFS patients actually have detectable brainstem or subcortical lesions, and why do imaging findings vary across studies?
What This Study Does Not Prove
This review does not prove that all ME/CFS cases result from RAS damage, nor does it establish causation between viral infection and brainstem lesions. The inconsistencies in imaging studies noted by the author mean the brainstem hypothesis remains unproven. Additionally, the review does not differentiate between primary viral injury and secondary inflammatory or immune-mediated damage.
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 →