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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 ]
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]
Proliferative fasciitis and proliferative myositis (PF/PM) are rare benign soft tissue lesions (i.e. a damaged or unspecified abnormal change in a tissue) that increase in size over several weeks and often regress over the ensuing 1–3 months. [1] The lesions in PF/PM are typically obvious tumors or swellings.
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]
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.
The development of necrotizing myopathy after statin exposure is insufficient to make the diagnosis. Testing must first exclude other causes of myositis and necrotizing myopathy. [7] A muscle biopsy consistent with SAAM will demonstrate muscle cell death with muscle fiber regeneration and typically has few inflammatory cells.
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 ...