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Myositis is a rarely-encountered medical condition characterized by inflammation affecting the muscles. [2] The manifestations of this condition may include skin issues, muscle weakness , and the potential involvement of other organs. [ 3 ]
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]
In up to 20% to 30% of cases, these lesions are apparently preceded by some sort of mechanical injury. [1] Individuals commonly present within 1–3 weeks [ 1 ] or, rarely, longer times (e.g. 3 months) [ 8 ] of noticing a rapidly growing, small (<5 cm. in size) mass or swelling in the subcutaneous tissues or muscles [ 1 ] of an extremity or ...
Although they vary in particulars, polymyositis, dermatomyositis and inclusion body myositis are idiopathic inflammatory myopathies (IIM) [1] primarily characterized by chronic inflammation of human skeletal muscle tissue [2] that ultimately causes the necrosis of muscle cells. This degeneration leads to muscle tissue wasting, weakness and ...
Benign acute childhood myositis (BACM) is a syndrome characterized by muscle weakness and pain in the lower limbs that develop in children after a recent viral illness. It is transient with a spontaneous clinical resolution within 1 week.
Inclusion body myositis (IBM) (/ m aɪ oʊ ˈ s aɪ t ɪ s /) (sometimes called sporadic inclusion body myositis, sIBM) is the most common inflammatory muscle disease in older adults. [2] The disease is characterized by slowly progressive weakness and wasting of both proximal muscles (located on or close to the torso ) and distal muscles (close ...
Myositis is more commonly seen in those with anti-Jo1 than other antibodies. [17] Myopathy in antisynthetase syndrome can range from subclinical to substantial proximal weakness causing difficulties climbing stairs, reaching overhead cupboards, or getting up from a seated position.
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 ...