Very important point about statin induced myopathy by Dr. Christopher-Stine. If 1) history of statin exposure, 2) typical symptoms of myositis 3) HMGCR ab positive — do NOT need biopsy and can treat as statin associated necrotizing autoimmune myopathy! @RheumNow #ACR22 https://t.co/VHxPRkCWwj