患儿男,12岁,因腹痛半天拟“腹膜炎,过敏性紫癜”于1992年4月2日住本院外科。入院当日上午始腹痛,先于脐周,后为全腹痛,逐渐加重。入院前5～6天出现四肢关节疼痛,呈游走性,自踝关节开始,逐渐向上肢关节发展,但不红肿;疼痛第二日,两下肢及臀部出现散在性出血点,目疼痛加重, Child male, 12 years old, due to abdominal pain for a long time to be “peritonitis, allergic purpura” in April 2, 1992 to live in hospital surgery. Admission the first day of the morning abdominal pain, before the umbilical weeks, after the full abdominal pain, and gradually increased. 5 to 6 days before admission, limb pain occurred, appeared migratory, starting from the ankle, and gradually to the development of upper limb joints, but not inflamed; pain the second day, two lower extremities and buttocks scattered bleeding, headache increased,