患儿,男,10岁。一月前开始上腹部隐痛,睡眠时喜左侧卧位,能坚持上学和一般活动。食欲正常,无泛酸、嗳气、反胃、恶心、呕吐等现象。近二周来有柏油样大便,不成形,无粘液及里急后重感。近一周来面色苍白加重,并有头晕、乏力、眼花而急症入院。半年前曾有柏油样大便史。体检:体温37.3℃,心 Children, male, 10 years old. A month ago before the pain in the upper abdomen, sleep left hi lateral position, able to adhere to school and general activities. Normal appetite, no pantothenic acid, belching, nausea, nausea, vomiting and so on. Nearly two weeks to have tarry stool, no shape, no mucus and tenesmus. Nearly a week to pale, and dizziness, fatigue, vertigo and acute admission. Six months ago there was a history of tarry stools. Physical examination: body temperature 37.3 ℃, heart