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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.
The infection can affect any skeletal muscle, but most often infects the large muscle groups such as the quadriceps or gluteal muscles. [2] [4] [5] Pyomyositis is mainly a disease of children and was first described by Scriba in 1885. Most patients are aged 2 to 5 years, but infection may occur in any age group.
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]
[1] [9] [10] This is due to a number of factors, including: overlapping symptoms (such as muscle weakness, pain, elevated CK); that delaying treatment for an inflammatory myopathy, in order to exclude potential non-inflammatory myopathies, may cause irreversible damage (although administering immunosuppressants and glucocorticosteroids to non ...
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 ...
Scleromyositis, is an autoimmune disease (a disease in which the immune system attacks the body). People with scleromyositis have symptoms of both systemic scleroderma and either polymyositis or dermatomyositis, and is therefore considered an overlap syndrome.
This is a shortened version of the fourth chapter of the ICD-9: Diseases of the Blood and Blood-forming Organs. It covers ICD codes 280 to 289 . The full chapter can be found on pages 167 to 175 of Volume 1, which contains all (sub)categories of the ICD-9.