Necrotizing autoimmune myopathy (NAM) is a relatively recently discovered subgroup of inflammatory myopathies. NAM is characterized by predominant muscle fiber necrosis and regeneration with little or no inflammation.1 One subgroup of NAM is 3-hydroxy-3-methylglutaryl-CoA reductase antibody (HMGCR Ab)-related immune-mediated necrotizing myopathy (IMNM), which occurs (rarely) after statin exposure, with a rough incidence of two per…