Predictive value of lesions for relapses in relapsing-remitting multiple sclerosis

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Relapsing-remitting multiple sclerosis (RRMS) is characterized by unpredictable exacerbations.
• Contrast-enhanced T1-weighted MR images showing enhancing lesions have been suggested as predictors of impending RRMS exacerbations.

Purpose of the Study:

• To evaluate the predictive accuracy of enhancing lesions, new enhancing lesions, and new hypointense lesions ("black holes") for RRMS exacerbations.
• To assess these MRI markers in a cohort of 50 RRMS patients over a 6-month timeframe.

Main Methods:

• Monthly MRI scans and clinical examinations were conducted for 50 RRMS patients over 12 months.
• The study analyzed the operating characteristics of enhancing lesions, new enhancing lesions, and new black holes as predictors of clinical relapse.

Main Results:

• The positive predictive values (PV+) for exacerbations from enhancing lesions, new enhancing lesions, or new black holes did not exceed 0.25.
• The best predictor for new enhancing lesions was their occurrence in the prior 3 months (PV+: 0.79).
• New black holes were best predicted by their occurrence in the prior 2 months (PV+: 0.54).

Conclusions:

• No single MRI marker reliably predicted impending relapses in RRMS with high precision.
• The absence of observed MRI markers correlated with a more favorable clinical course, indicating fewer relapses.