Diagnosis is fourfold: History and physical examination, elevation of creatine kinase, electromyograph (EMG) alteration, and a positive muscle biopsy. The hallmark clinical feature of<unk>  is proximal muscle weakness, with less important findings being muscle pain and dysphagia. Cardiac and pulmonary findings will be present in approximately 25% of cases of patients with<unk> . Sporadic inclusion body myositis (sIBM): IBM is often confused with (misdiagnosed as)<unk>  or dermatomyositis that does not respond to treatment is likely IBM. sIBM comes on over months to years;<unk>  comes on over weeks to months.<unk>  tends to respond well to treatment, at least initially; IBM does not.
Polymyositis
Scleroderma
Dermatopolymyositis
Dermatomyositis
Inclusion body myositis
Nemaline myopathy
Inflammatory myopathy
Metabolic myopathy