PT  - JOURNAL ARTICLE
AU  - Sherry Rohekar
AU  - Laurence Rubin
TI  - Development of polymyositis after long-standing rheumatoid arthritis.
DP  - 2006 Feb 01
TA  - The Journal of Rheumatology
PG  - 362--363
VI  - 33
IP  - 2
4099  - http://www.jrheum.org/content/33/2/362.short
4100  - http://www.jrheum.org/content/33/2/362.full
SO  - J Rheumatol2006 Feb 01; 33
AB  - Rheumatoid arthritis (RA) and polymyositis (PM) are distinct clinical syndromes. The concurrent diagnoses of RA and PM in the same patient are rare. We describe a patient who developed outright PM after 16 years of well established RA, review the literature, and highlight the need to consider a broad base of differentials including PM in the diagnosis of muscle weakness in RA.