How do you approach weakly positive PL-7 antibody in a patient who initially presented with muscle weakness, rhabdomyolysis and non specific muscular edema on MRI that resolved with IV fluids?   

During an episode of rhabdomyolysis, muscle MRI isn't reliable since it would be positive regardless of the underlying cause. So, monitoring the trajectory of CPK levels and serial muscle exams to evaluate for weakness would offer a more reliable assessment for true myositis. Positive antibody resul...