Muscle biopsy is the gold standard test for the diagnosis of<unk>  and dermatomyositis. Necrosis, increase in endomysial and perimysial connective tissue, atrophy and degeneration of both type I and II fibers, especially in a perifascicular distribution might be seen in muscle biopsy. The muscle biopsy should be performed when a patient presented with symptoms of muscle weakness and skin rash or elevated level of muscle enzymes.
Polymyositis and dermatomyositis diagnostic study of choice
Polymyositis and dermatomyositis other diagnostic studies
Dermatomyositis other diagnostic studies
Polymyositis and dermatomyositis differential diagnosis
Polymyositis and dermatomyositis risk factors
Polymyalgia rheumatica other diagnostic studies
Mixed connective tissue disease diagnostic study of choice
Multiple sclerosis other diagnostic studies