患儿 ,女性 ,12岁。主因右足趾肿痛 ,月经量过多 1个月 ,低热伴乏力 ,关节痛 1周入院。患儿 1个月前无明显诱因出现右足小趾肿胀 ,伴压痛 ,足趾皮肤略红 ,同时第二次月经来潮 ,量多、经期长 ,且晕厥 1次 ,无经期不适 ,经期 14天。近 1周无明显诱因又出现发热 ,热型不规则 ,伴乏 Children, women, 12 years old. The main cause of right toe swelling and pain, excessive menstrual flow for 1 month, fever and fatigue, arthralgia 1 week hospitalization. Children with no obvious incentive to appear a month ago little toe swelling of the right foot, with tenderness, slightly red toe skin, while the second menstrual cramps, quantity, long period, and syncope 1, no menstrual discomfort, menstruation 14 days. Nearly a week without obvious incentives and fever, irregular heat, accompanied by lack of