Causes Neuromuscular disease

polymyositis

inflammatory muscle disorders

polymyalgia rheumatica (or muscle rheumatism ) inflammatory condition occurs in elderly; associated giant-cell arteritis(it responds prednisolone).
polymyositis autoimmune condition in muscle affected.
rhabdomyolysis breakdown of muscular tissue due cause.

tumors

smooth muscle: leiomyoma (benign)
striated muscle: rhabdomyoma (benign)




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^ polymyositis: background, etiology, epidemiology . 
^ rhabdomyolysis: medlineplus medical encyclopedia . www.nlm.nih.gov. retrieved 2016-04-24. 
^ leiomyoma: practice essentials, background, pathophysiology . 
^ rhabdomyomas: background, pathophysiology , etiology, epidemiology .