<prompt> Regarding rheumatoid ahritis, all of the following statements are true except-The cricoarytenoid joint may be involvedHLA-D4 and HLA-DR4 are positive in patients with seropositive rheumatoid ahritisSubcutaneous nodules are more frequent in seronegative patientsDiffuse intestinal fibrosis and pneumonitis may occur  <response>: Rheumatoid nodules occur almost exclusively in RF or ACPA positive patients, usually in extensor tendons . Theyare frequently asymptomatic but some may be complicated by ulceration and secondary infection . Ref Davidsons 23e p1023,1024 