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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.
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 ...
Affected are preschool and school-age children with a male predominance. [2] In one study, the median age was 6 years (range 2–13.2 years). [1] It has been estimated that BACM has an incidence of 2.69 cases per 100,000 children (<18 years) during epidemic seasons and 0.23 cases during non-epidemic seasons. [3]
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]
There have been few randomized treatment trials, due to the relative rarity of inflammatory myopathies. [4] The goal of treatment is improvement in activities of daily living and muscle strength. Suppression of immune system activity (immunosuppression) is the treatment strategy. Patients with PM or DM almost always improve to some degree in ...
It manifests itself in children; it is the pediatric counterpart of dermatomyositis. In JDM, the body's immune system attacks blood vessels throughout the body, causing inflammation called vasculitis. In the United States, the incidence rate of JDMS is approximately 2-3 cases per million children per year. The UK incidence is believed to be ...
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 polymyositis or sIBM. [36]
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