幼年类风湿关节炎是指16岁以前发病的以慢性滑膜炎为主要特征并伴有全身多系统损害的儿童关节炎。其病因、发病机制和病理变化均与成年人类风湿关节炎相似。临床表现特点是除关节症状和畸形外,全身症状常常很明显,如发热,皮疹,肝、脾、淋巴结肿大,贫血,心包炎,胸膜炎,虹膜睫状 Juvenile rheumatoid arthritis refers to the onset of arthritis in children aged 16 years old characterized by chronic synovitis and associated with systemic multiple system damage. The etiology, pathogenesis and pathological changes are similar to adult rheumatoid arthritis. In addition to the clinical manifestations of joint symptoms and deformities, the systemic symptoms are often obvious, such as fever, rash, liver, spleen, enlarged lymph nodes, anemia, pericarditis, pleurisy, iris ciliary