Introduction: Rheumatoid arthritis (RA) is a chronic inflammatory systemic autoimmune disease. Lung disease has beenrecognized as a common complication of RA. Omega-3 is an essential fatty acid with wide range of activity.Aim of the work: To investigate the possible therapeutic role of omega-3 free fatty acid on the structure of ankle joint andlung in a model of adjuvant-induced RA in rats.Materia...