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Thursday

 

The effect of venous anatomy on the morphology of MS lesions: a susceptibility-weighted imaging study: STUDY


































Image Source: SBAFFUTOK



Aim:
To investigate the cause of morphology in non-ovoid multiple sclerosis (MS) lesions lacking a radial course and typical shape.

Materials and methods:
Non-ovoid atypical lesions without perpendicular extensions to the ventricle were investigated in 95 MS patients by retrospective examination of T2-weighted and fluid-attenuated inversion recovery (FLAIR) images. The relationship between the morphology of these atypical lesions detected in 38 patients and central vein anatomy was examined using susceptibility-weighted imaging (SWI).

Results:
A central venous structure was observed in 107 (65.6%) of 163 atypical lesions in 38 patients. The distribution of atypical lesions grouped by their shape was as follows: (1) V- or Y-shaped lesions (n=27, 48.6%) were observed where veins bifurcated; (2) crescent-shaped lesions (n=9, 8.4%) were observed where veins formed an arc; (3) patchy lesions comprised 48.6% (n=52) of the atypical lesions and involved multiple medullary veins or medullary veins showing a “caput medusae” distribution; (4) ovoid lesions with a non-radial course (n=19, 17.7%) were generally observed where medullary veins converged to form internal cerebral vein branches.

Conclusion:
Unlike typical MS plaques, non-ovoid atypical lesions make the differential diagnosis of MS challenging. Demonstration of the relationship between venous anatomy and lesion morphology in atypical lesions using SWI will aid in the differential diagnosis.

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