TTN Lower limbs

Lower-limb muscle MR images were reviewed and, if available, 30 muscles were systematically scored with a modified Mercuri score system. Extensor digitorum longus and extensor hallucis longus were evaluated together. A normal muscle was scored by 0. A score of 1 for scattered small areas of increase density. If muscle was replaced in a 30-60%, we scored 2 and if the replacement implies 60-90%, 3. A score of 4 was used for muscles with complete or nearly complete fat replacement. Each patient was evaluated by two independent reviewers (DGA and LCC). Discrepancies were discussed, and a final score was decided by consensus. Significant asymmetric involvement between right and left limb was also evaluated in each muscle.