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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 ...
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]
Dermatomyositis is a form of systemic connective tissue disorder, a class of diseases that often involves autoimmune dysfunction. [12] [16] 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]
Metabolic myopathies, which affect the production of ATP within the muscle cell, typically present with dynamic (exercise-induced) rather than static symptoms. [4] Most of the inflammatory myopathies can have a chance association with malignant lesion; the incidence appears to be specifically increased only in patients with dermatomyositis. [5]
The skin involvement of dermatomyositis is absent in polymyositis. Dysphagia (difficulty swallowing) or other problems with esophageal motility occur in as many as 1/3 of patients. Low grade fever and enlarged lymph nodes may be present. Foot drop in one or both feet can be a symptom of advanced polymyositis and inclusion body myositis.
Autoimmune - Autoimmune disease is an abnormal immune response to specific body protein or other biomolecular target, such as one of the muscles. The three main types of idiopathic myositis (known as inflammatory myopathies) that typically test positive for autoantibodies are dermatomyositis, polymyositis, and inclusion body myositis. [4]
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 ...
Similar to other subtypes of idiopathic inflammatory myopathy, except for sporadic inclusion body myositis, antisynthetase syndrome is more common in women, with an estimated female-to-male ratio of roughly 7:3. In patients with dermatomyositis and polymyositis, the mean age at disease onset is 48 years, which is older than in patients with ...