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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Locus Coeruleus MR Measured Signal Intensity in Fibromyalgia Relative to Healthy Controls.

Marilena M DeMayo^1,2,3,4,5, Clifford M Cassidy⁶, Cheryl McCreary^2,4,7

¹Department of Psychiatry, University of Calgary, Calgary, Alberta, Canada.

European Journal of Pain (London, England)

|November 17, 2025

Summary

This summary is machine-generated.

Magnetic resonance imaging did not show differences in locus coeruleus (LC) signal intensity in fibromyalgia patients compared to controls. This suggests noradrenergic system function may not be a key factor in fibromyalgia development or symptoms.

Keywords:

fibromyalgia locus coeruleus magnetic resonance neuromelanin noradrenaline

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Area of Science:

Neuroimaging
Pain Medicine
Neurology

Background:

Fibromyalgia is a chronic pain disorder with unknown causes.
Noradrenergic dysfunction is a potential mechanism.
Neuromelanin in the locus coeruleus (LC) is a marker for noradrenergic function.

Purpose of the Study:

To investigate the noradrenergic-locus coeruleus system in fibromyalgia using MR imaging.
To assess LC signal intensity as a proxy for noradrenergic function in fibromyalgia patients.

Main Methods:

Cross-sectional study comparing 46 fibromyalgia patients and 41 healthy controls.
Quantified LC signal intensity using 3T MR imaging (2D gradient echo acquisition).
Assessed fibromyalgia impact, anxiety, depression, sleep, and cognitive function.

Main Results:

No significant difference in LC signal intensity between fibromyalgia patients and controls.
No association found between LC signal intensity and fibromyalgia severity, pain, or associated symptoms.
Medication use targeting the noradrenergic system in nearly 90% of fibromyalgia patients complicated interpretation.

Conclusions:

MR-measured LC signal intensity does not differentiate fibromyalgia patients from controls.
Noradrenergic function, as assessed by LC signal intensity, is not associated with fibromyalgia symptoms.
Dynamic measures of noradrenergic function may be necessary to understand its role in fibromyalgia.