How would you differentiate new onset inflammatory myositis from paraneoplastic phenomena in a patient with recurrent uterine cancer who is taking aromatase inhibitor?   

Unfortunately, distinguishing whether the patient's dermatomyositis (DM) is "idiopathic" or paraneoplastic the patient with active/recent malignancy is incredibly difficult, if not impossible. While certain myositis-specific autoantibodies (MSA) such as anti-TIF-gamma and anti-NXP-2 are associated w...