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NLSDM patient's clinical and imaging features. (a) Upper limb abduction weakness, predominant on the right side and (b) calves hypertrophy. Thigh (c) and leg (d) muscle MRI: marked T1w changes with almost complete fatty infiltration of biceps femoris and semimembranosus (c) and soleus (d); lower severity involvement has been observed in medial gastrocnemius and peroneal longus (arrowheads) (d).
