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It can also be associated with underlying cancer. The main classes of idiopathic inflammatory myopathy are polymyositis (PM), dermatomyositis (DM) (including juvenile, amyopathic, and sine-dermatitis form), inclusion-body myositis (IBM), immune-mediated necrotising myopathy (IMNM), and focal autoimmune myositis. [1]
The development of necrotizing myopathy after statin exposure is insufficient to make the diagnosis. Testing must first exclude other causes of myositis and necrotizing myopathy. [7] A muscle biopsy consistent with SAAM will demonstrate muscle cell death with muscle fiber regeneration and typically has few inflammatory cells.
Polymyositis produces muscle weakness. It can often be treated by drugs like corticosteroids or immunosuppressants. Inclusion body myositis is a slowly progressive disease that produces weakness of hand grip and straightening of the knees. No effective treatment is known. (M60.9) Benign acute childhood myositis (M61) Myositis ossificans
Common types of myopathy due to statins include myalgia, myositis, and rhabdomyolysis. Statins induce myopathy by inhibiting protein synthesis within the muscle. [6] Statin therapy tends to not show any histopathological differences, and thus a biopsy does not reveal too much about the damage. Often, the damage is found within the mitochondria. [1]
Polymyositis and the associated inflammatory myopathies have an associated increased risk of cancer. [3] The features they found associated with an increased risk of cancer were older age, age greater than 45, male sex, difficulty swallowing, death of skin cells, cutaneous vasculitis, rapid onset of myositis (<4 weeks), elevated creatine kinase, higher erythrocyte sedimentation rate and higher ...
It has also been classified as an idiopathic inflammatory myopathy, along with polymyositis, necrotizing autoimmune myositis, cancer-associated myositis, and sporadic inclusion body myositis. [17] A form of this disorder that occurs prior to adulthood is known as juvenile dermatomyositis. [18]
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In patients with dermatomyositis and polymyositis, the mean age at disease onset is 48 years, which is older than in patients with immune-mediated necrotizing myopathy and sporadic inclusion body myositis. [13]