A LIGHT AND ULTRASTRUCTURAL-STUDY OF RICE BODIES RECOVERED FROM A CASE OF DATE THORN-INDUCED EXTRAARTICULAR SYNOVITIS

Rice bodies are most commonly found in inflammatory joints of patients with rheumatoid arthritis and have traditionally been considered to b e a nonspecific response to inflammatory synovial disease. In the pres ent study 18 rice bodies were found in the tibialis tendon sheath of a nine-year-old Omani boy subsequent to a date thorn injury. The rice b odies consisted of three major components: fibrin, collagen, and fibro blasts. In contrast to the findings of other authors there were no typ e A, B, or C synoviocytes, cartilage, or vascularisation of the rice b ody. At this extra-articulate site it would appear that rice bodies ar e composed chiefly of fibrin and that the fibrosis of the rice body oc curs as a result of the entrapment of fibroblasts, which subsequently produce collagen. These findings shed doubt on the synovial origin of rice bodies and suggest that rice bodies may have multiple origins, de pending on their location. This is the first ultrastructural study of rice bodies associated with a date thorn injury.