TY - JOUR T1 - Development of polymyositis after long-standing rheumatoid arthritis. JF - The Journal of Rheumatology JO - J Rheumatol SP - 362 LP - 363 VL - 33 IS - 2 AU - Sherry Rohekar AU - Laurence Rubin Y1 - 2006/02/01 UR - http://www.jrheum.org/content/33/2/362.abstract N2 - 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. ER -