Increasing signal intensity within the dentate nucleus and globus pallidus on unenhanced T1W magnetic resonance images in patients with relapsing-remitting multiple sclerosis: correlation with cumulative dose of a macrocyclic gadolinium-based contrast agent, gadobutrol
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To evaluate correlation between cumulative dose of gadobutrol and signal intensity (SI) within dentate nucleus and globus pallidus on unenhanced T1-weighted images in patients with relapsing-remitting multiple sclerosis (RRMS).
Dentate nucleus-to-pons and globus pallidus-to-thalamus SI ratios, and renal and liver functions, were evaluated after multiple intravenous administrations of 0.1 mmol/kg gadobutrol at 27, 96–98, and 168 weeks. We compared SI ratios based on the number of administrations, total amount of gadobutrol administered, and time between injections.
Globus pallidus-to-thalamus (p = 0.025) and dentate nucleus-to-pons (p < 0.001) SI ratios increased after multiple gadobutrol administrations, correlated with the number of administrations (ρ = 0.263, p = 0.046, respectively) and depended on the length of administration (p = 0.017, p = 0.037, respectively). Patients receiving gadobutrol at 27 weeks showed the greatest increase in both SI ratios (p = 0.006; p = 0.014, respectively, versus 96–98 weeks). GGT increased at the end of the study (p = 0.004).
In patients with RRMS, SI within the dentate nucleus and globus pallidus increased on unenhanced T1-weighted images after multiple gadobutrol injections. Administration of the same total amount of gadobutrol over a shorter period caused greater SI increase.
• Gadolinium deposition may occur within the human brain after multiple gadolinium contrast administrations
• Increasing T1W signal intensity occurs within the dentate nucleus and globus pallidus
• Increasing signal intensity may be a consequence of multiple administrations of gadobutrol
• Administration of gadobutrol over a shorter period causes greater signal intensity increase
KeywordsMagnetic resonance imaging Contrast media Globus pallidus Dentate nucleus Gadolinium deposition
Magnetic resonance imaging
Relapsing-remitting multiple sclerosis
Secondary progressive multiple sclerosis
The scientific guarantor of this publication is Prof. Dr. Dragan Stojanov The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. One of the authors has significant statistical expertise. No complex statistical methods were necessary for this paper. Institutional Review Board approval and written informed consent were not required because the retrospective nature of our clinically acquired data. At the time of the examination, however, all patients had given consent to use their clinical and imaging data for research. Study subjects or cohorts have not been previously reported. Methodology: prospective / retrospective.
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