男患,28岁,因间断性黑便3年余,加重6天于1990年12月19日入院。患者自1987年6月份起不明原因出现黑红色、稀水样便,每日2～3次,每次量最多可达300ml,在本单位口服止血药,持续一周治愈。在此以后,每逢重体力劳动后发作,每年发作1～2次,每次持续时间约一周,开始为黑红色稀便,而后为黑色成形便,无腹痛、无畏寒、发热、无里急后 Male suffering, 28 years old, due to intermittent melena more than 3 years, increased 6 days in December 19, 1990 admission. Patients since June 1987 unexplained black and red, watery stools, 2 or 3 times a day, up to 300ml per dose, oral administration of hemostatic drugs in this unit, continued for a week to cure. After that, every heavy physical labor after the attack, attack 1 or 2 times a year, each duration of about a week, began to black and red loose stools, and then black for the stool, no abdominal pain, no chills, fever, no urgency Rear