Myositis, also known as myopathy, familial idiopathic inflammatory, is related to idiopathic inflammatory myopathy and dermatomyositis, and has symptoms including back pain, muscle cramp and muscle rigidity. An important gene associated with Myositis is MSTN (Myostatin), and among its related pathways/superpathways are Neuroscience and Presenilin-Mediated Signaling. The drugs Titanium dioxide and Silicon have been mentioned in the context of this disorder. Affiliated tissues include skin and skeletal muscle, and related phenotypes are myositis and proximal muscle weakness