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These MRI findings are characteristic signs of multiple sclerosis lesions. When lesions appear in these specific brain areas, they indicate areas where the immune system has attacked the myelin sheath (the protective covering of nerve fibers), causing inflammation and scarring in the central nervous system. MRI scans show Show Full Answer

These MRI findings are characteristic signs of multiple sclerosis lesions. When lesions appear in these specific brain areas, they indicate areas where the immune system has attacked the myelin sheath (the protective covering of nerve fibers), causing inflammation and scarring in the central nervous system. MRI scans show these lesions as darker or lighter spots, and when contrast fluid (gadolinium) is used, it can reveal whether the lesions are active (recent) or older than three months. The type, size, and distribution of these lesions are important factors in the McDonald criteria used to diagnose MS. Some of these lesions may be "smoldering lesions" which have dark boundaries visible on specialized MRI techniques. These particular lesions can remain active for long periods and continue growing over years, potentially causing ongoing nerve damage in the affected brain areas.

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