TY - JOUR T1 - A Rare Cause of Foot Swelling Mimicking Tenosynovitis JF - The Journal of Rheumatology JO - J Rheumatol SP - 1977 LP - 1977 DO - 10.3899/jrheum.100264 VL - 37 IS - 9 AU - NEIL MO AU - VUN LIM AU - JONATHAN J. GREGORY AU - PAUL COOL Y1 - 2010/09/01 UR - http://www.jrheum.org/content/37/9/1977.abstract N2 - To the Editor:Tenosynovitis occurring over the digital extensors of the extremities is a common cause of soft tissue swelling seen by the rheumatologist. We describe a case of long-standing soft tissue swelling on the dorsum of the foot. This was initially attributed to tenosynovitis but gradually became more edematous. Indeterminate radiological findings prompted a biopsy, which revealed an unusual low-grade tumor with metastatic potential. We highlight the importance of obtaining a soft-tissue biopsy if there is any degree of diagnostic uncertainty after radiological imaging.A 54-year-old woman presented with a 12-month history of painful swelling over the dorsum of the right foot. The swelling varied in size, the patient describing discrete episodes of more pronounced swelling for up to 2 weeks. There was a family history of rheumatoid arthritis in the mother and sister. The patient did not experience … Address correspondence to Dr. Mo; E-mail: nmo{at}doctors.net.uk ER -