We present two patients with advanced rheumatoid arthritis (RA) who were diagnosed as having malignant soft-tissue tumours on magnetic resonance scanning. They were tertiary referrals to a unit specialising in the management of soft-tissue sarcoma.
Both of these tumours subsequently turned out to be benign complications of RA. In both of these cases, no mention was made on the initial radiological request form of the presence of RA. It is essential to give an adequate past medical history when requesting any radiological investigation.