患者冯某,男性,30岁,因黑便、乏力20余天入院。患者20余天来每日黑便1-2次,为不成形软便,伴疲乏无力,无明显腹痛,无呕血,发病以来,体重下降约5公斤。查体:全身浅表淋巴结均未触及,面色及口唇苍白。心肺未闻及明显异常。腹部平坦,腹肌软,全腹无压痛、反跳痛,肝脾肋下未触及,坐位时,左上腹可触及一大小 Fengmou patients, men, 30 years old, due to melena, fatigue more than 20 days admitted to hospital. Patients with more than 20 days to black melena 1-2 times a day, for the formation of loose stools, with fatigue, no obvious abdominal pain, no vomiting, the onset, the weight loss of about 5 kg. Physical examination: systemic superficial lymph nodes were not touched, pale and lips pale. Cardiopulmonary unknown and obvious abnormalities. Abdomen flat, abdominal muscle soft, full no tenderness, rebound tenderness, liver and spleen ribs not touched, sitting, the left upper quadrant can reach a size