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Longitudinal assessment of lesion volume and ADC in patients with Fabry disease: a 5 year follow up study
Koen P.A. Baas1, Simon Körver2, Bram F. Coolen3, Gustav J. Strijkers3, Carla E.M. Hollak2, and Aart J. Nederveen1
1Radiology and Nuclear Medicine, Amsterdam UMC, Amsterdam, Netherlands, 2Endocrinology and Metabolism, Amsterdam UMC, Amsterdam, Netherlands, 3Biomedical Engineering and Physics, Amsterdam UMC, Amsterdam, Netherlands
ADC values in Fabry patients were significantly higher within white matter lesions compared to healthy white matter, and increased further with lesion age. Moreover, before lesions were detected on FLAIR images, we already found abnormal ADC values in these specific regions. 
Figure 1: lesion progression in three patients projected on WM segmentations (left) and corresponding slices of ADC maps (right). Colors indicate the age of the lesion. Only four time points were available for patient one and does therefore not show lesion age of five years. Patient two and three had five available time points.
Figure 2: averaged ADC values within newly detected WML as a function of lesion age. WMLs that were present at the first time point were not included because the age of these lesions cannot be determined. Error bars denote standard deviations. Linear regression of all individual newly detected lesion areas after each year showed a significant correlation between lesion age and ADC.