Destructive Polyarthritis Due to a Photochromogenic Mycobacterium

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Abstract
RECENTLY there has been increasing clinical awareness of a group of micro-organisms, variously named the "anonymous," "atypical," "saprophytic" or "unclassified" mycobacteria, which are apparently related to Mycobacterium tuberculosis but differ in certain cultural, metabolic and colonial features.1 These organisms have been reported as the cause of human pulmonary disease2 and cervical adenitis,3 but there have been only a few reports of bone or joint involvement.4 5 6 7 8 The present case of destructive polyarthritis due to an anonymous mycobacterium not only posed an interesting problem in differential diagnosis but is the first known to have responded favorably to antituberculous therapy.Case ReportJ.P., . . .