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A multiparametric MRI study of frontal lobe dementia in multiple sclerosis
G Comi1, M Rovaris, M Falautano
1Clinical Trials Unit, Department of Neuroscience, Scientific Institute H San Raffaele, Via Olgettina 60, 20132, Milan, Italy. comi.giancarlo@hsr.it
Abstract:
Previous studies achieved conflicting results when correlating magnetic resonance imaging (MRI) abnormalities and cognitive impairment in multiple sclerosis (MS) patients. Recently, the estimation of MS lesion load on T1-weighted images and the analysis of magnetization transfer ratio (MTR) histograms, increased the degree of the correlation between physical disability and MRI findings in MS. We assessed the relationship of conventional and non-conventional MRI-derived measures with frontal lobe dementia in MS. Dual echo, T1-weighted and MT MRI scans of the brain were obtained in 11 MS patients with and in 11 without frontal lobe dementia, matched for age, sex, education and disability. Total (TLL) and frontal (FLL) lesion loads were assessed from T2- and T1-weighted scans. MTR histogram analysis was performed for the whole brain, the frontal lobe and the cerebellum. Median TLL and FLL were significantly higher in cognitively impaired patients on both T2- and T1-weighted scans. The MRI measure that better discriminated the two groups of patients was T1-weighted TLL (median values were 19.1 ml for demented and 1.9 ml for non-demented patients, P=0.006). Average MTR, peak height and location of overall brain and frontal lobe histograms were significantly lower for cognitively impaired than for cognitively intact patients (P values ranged from 0.0001 to 0.001). Cerebellar MTR histogram metrics did not significantly differ in patients with and without cognitive decline. The presence of cognitive decline in MS is associated with the extent and pathological severity of brain MRI abnormalities.
Insights
Magnetic resonance imaging (MRI) abnormalities, including lesion load and magnetization transfer ratio (MTR) histograms, correlate with cognitive impairment in multiple sclerosis (MS) patients. Advanced MRI measures better identify dementia in MS.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Conflicting results exist regarding the correlation between magnetic resonance imaging (MRI) abnormalities and cognitive impairment in multiple sclerosis (MS).
- Recent advancements in estimating MS lesion load and analyzing magnetization transfer ratio (MTR) histograms have improved correlation with physical disability in MS.
- Frontal lobe dementia is a significant concern in MS patients, necessitating better diagnostic tools.
Purpose of the Study:
- To assess the relationship between conventional and non-conventional MRI-derived measures and frontal lobe dementia in MS patients.
- To identify specific MRI markers that can effectively differentiate MS patients with and without cognitive decline.
Main Methods:
- Brain MRI scans (dual echo, T1-weighted, MT) were acquired from 22 MS patients (11 with and 11 without frontal lobe dementia), matched for age, sex, education, and disability.
- Total (TLL) and frontal (FLL) lesion loads were quantified from T2- and T1-weighted scans.
- MTR histogram analysis was performed on the whole brain, frontal lobe, and cerebellum.
Main Results:
- Median TLL and FLL were significantly higher in cognitively impaired MS patients on both T2- and T1-weighted scans.
- T1-weighted TLL was the most discriminating MRI measure (19.1 ml vs. 1.9 ml, P=0.006).
- Average MTR, peak height, and location of brain and frontal lobe histograms were significantly lower in cognitively impaired patients (P<0.001). Cerebellar MTR metrics did not differ significantly.
Conclusions:
- Cognitive decline in MS is associated with the extent and pathological severity of brain MRI abnormalities.
- Advanced MRI techniques, particularly T1-weighted lesion load and MTR histogram analysis, are valuable for detecting and understanding cognitive impairment in MS.
- These findings highlight the utility of neuroimaging in assessing the impact of MS on cognitive function.