Immune-mediated necrotizing myopathy

Necrotizing autoimmune myopathy (NAM) is a rare form of idiopathic inflammatory myopathy characterized clinically by acute or subacute proximal muscle weakness, and histopathologically by myocyte necrosis and regeneration without significant inflammation.

Rhabdomyolysis

Breakdown of muscle fibers that leads to the release of muscle fiber contents (myoglobin) into the bloodstream.


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PMID (PMCID)
22453528
MALE
Camptocormia as a clinical manifestation of polymyositis/systemic sclerosis overlap myositis associated with anti-Ku.
Zenone T, Streichenberger N, Puget M.
Rheumatol Int. 2013;33(9):2411-5.
Quadriceps muscle biopsy showed significant rhabdomyolysis, few isolated inflammatory cells and mild expression of type I MHC in few fibers, a pattern usually found in immune-mediated necrotizing myopathies.