HMGCR and acquired idiopathic inflammatory myopathy: Autoimmune-mediated necrotizing myopathy (IMNM) is a rare subgroup of idiopatic inflammatory myopathies (IIM) and associated with the anti-signal-recognition particle (anti-SRP54) or the anti–3-hydroxy-3-methylglutaryl-coenzyme A reductase (anti-HMGCR) autoantibodies (Ab) [1,2].