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In some instances, the origins of myositis remain idiopathic, without a discernible cause. Injury - A mild form of myositis can occur with hard exercise. [4] A more severe form of muscle injury, called rhabdomyolysis, is also associated with myositis. [4] This is a condition where an injury to the patient's muscles causes them to quickly break ...
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]
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, less commonly, the trunk wall, head, or neck areas. [6]
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 ...
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]
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 ...
This meaning implies that the primary defect is within the muscle, as opposed to the nerves ("neuropathies" or "neurogenic" disorders) or elsewhere (e.g., the brain). This muscular defect typically results in myalgia (muscle pain), muscle weakness (reduced muscle force), or premature muscle fatigue (initially normal, but declining muscle force).
Myositis may cause thickening of the muscle fascicles. [3] This may be detected with ultrasound scans. [3] Muscle fascicle structure is a useful diagnostic tool for dermatomyositis. Myocytes towards the edges of the muscle fascicle are typically narrower, while those at the centre of the muscle fascicle are a normal thickness. [4]