病人女性,78岁。2005年8月1日主因“黑便伴头晕乏力2周”门诊以“下消化道出血”收入北京市海淀医院。入院查体:体温36.4℃,血压18.7/12.0kPa,腹软,下腹轻压痛,未及明确肿物,肛门指诊未及肿物。病人自发病以来无腹痛腹泻等不适,否认肿瘤家族史。实验室检查:白细胞5.13×109/L( Female patient, 78 years old. August 1, 2005 The main reason for “black stools with dizziness, 2 weeks,” outpatient to “lower gastrointestinal bleeding” income Beijing Haidian Hospital. Admission examination: body temperature 36.4 ℃, blood pressure 18.7 / 12.0kPa, abdomen soft, lower abdomen soft tenderness, and no clear tumor, anal palpable mass. Since the onset of patients without abdominal pain and diarrhea and other discomfort, denied the family history of cancer. Laboratory tests: WBC 5.13 × 109 / L (