患儿 ,女 ,4岁 ,患儿于 2个月前开始出现低热及右侧肢体疼痛 ,间断发作 ,疼痛于发热时明显 ,热退时减轻。近一周来发展为双侧下肢疼痛 ,持续时间延长。自觉全身乏力、倦怠。无皮疹、鼻衄、牙龈出血 ,无腹痛、腹胀、血尿。查体 :精神欠佳 ,全身皮肤粘膜无黄染及出血点 ,无环形红 In children, women, 4 years old, the child began to appear low fever and right limb pain 2 months ago, intermittent attack, pain when fever, significantly reduced when heat retreat. He developed bilateral lower extremity pain in the past week and his duration increased. Consciously weak and tired. No rash, epistaxis, gum bleeding, abdominal pain, bloating, hematuria. Physical examination: poor spirit, no yellow dyeing and bleeding in the skin and mucous membrane of the body, no ring red