<unk>  is a connective-tissue disease that is characterized by inflammation of the muscles and the skin.  Its cause is currently unknown, but it may result from either a viral infection or an autoimmune reaction. Up to 50% of the cases may be a paraneoplastic phenomenon, indicating the presence of cancer.
X-ray findings include dystrophic calcifications in the muscles.
There is a form of this disorder that affects children, and it is known as juvenile<unk> .
"Gottron's papules", which are pink patches on the knuckles, and priapisms, are associated with this disorder.
Dermatomyositis
Inclusion body myositis
Scleromyositis
Juvenile dermatomyositis
Pyomyositis
Nemaline myopathy
Inflammatory myopathy
Centronuclear myopathy