患者:男性,20岁。主因间断紫癜样皮疹10年,腰困痛、多关节痛8年,加重1个月于2002年10月23日入院。1992年10月无明显诱因双下肢成批出现瘀点、瘀斑,呈暗红色,压之不褪色,融合成片,无乏力、发热、咽痛,无腹痛、腹泻,就诊当地医院考虑“过敏性紫癜”,对症治疗皮疹渐退。以后劳累、 Patient: Male, 20 years old. Mainly due to intermittent purpura-like rash 10 years, pain in the lumbar, joint pain for 8 years, an increase of 1 month in October 23, 2002 admission. October 1992 no obvious incentive to lower extremities appear in batches petechia, ecchymosis, dark red, the pressure does not fade, blending into tablets, no fatigue, fever, sore throat, no abdominal pain, diarrhea, treatment local hospital to consider “allergies Purpura ”, symptomatic treatment of rashes. After tired,