Although inflammation of muscle is not a rare complication of other diseases, it is exceedingly uncommon as a primary and independent affection. It is likely that the muscular involvement of acute rheumatism is inflammatory in character, and it may be that a part of what we are accustomed to designate subacute or muscular rheumatism and some forms of myalgia are also of like nature. It seems, further, not impossible that some cases diagnosed neuritis are complicated by, if not primarily a condition of, myositis. Some difference of opinion prevails as to whether the several varieties of primary muscle-inflammation are identical in character, though differing in degree—dependent upon the same cause, and the symptomatology varying with the virulence and the volume of the infecting agency on the one hand and the susceptibility of the individual attack on the other hand—or, whether the etiology is diverse and multiple. A clinical and pathological
POLYMYOSITIS. JAMA. 1901;XXXVI(1):40–41. doi:10.1001/jama.1901.02470010044013
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