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Infection - The most common infectious cause of myositis is viral infections, such as the common cold. [4] Other viruses, such as COVID-19, are also shown to be a rare cause of myositis. [6] Benign acute childhood myositis has been described in children after prodromal viral infections with different viral agents.
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]
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 ...
A rapid risk assessment conducted by the European Centre for Disease Prevention and Control (ECDC) concluded that the overall risk to children in the European Union (EU), European Economic Area (EEA) and the UK "is considered 'low', based on a 'very low' probability of [the disease] in children and a 'high' impact of such disease." [3]
IBM is often confused with (misdiagnosed as) polymyositis. Polymyositis that does not respond to treatment is likely IBM. [35] Dermatomyositis shares a number of similar physical symptoms and histopathological traits as polymyositis, but exhibits a skin rash not seen in polymyositis or sIBM. It may have different root causes unrelated to either ...
Underlying health conditions that raise the risk for Covid-19 complications, such as obesity and Type 2 diabetes, also tend to be more prevalent among members of racial and ethnic minority groups.
Eighty percent of adults [5] and sixty percent of children with juvenile dermatomyositis have a myositis-specific antibody (MSA). [6] Although no cure for the condition is known, treatments generally improve symptoms. [1] Treatments may include medication, physical therapy, exercise, heat therapy, orthotics, assistive devices, and rest. [1]
Risk factors for severe antisynthetase syndrome include calcinosis, esophageal involvement, cancer, interstitial lung disease without myositis, severe respiratory involvement, and older age at the time of diagnosis. [10] Muscle weakness and arthritis at the point of diagnosis have been noted as favorable outcome measures. [63]