患者,男性,69岁。因大便形状改变伴次数增多1ａ余,于1999年8月24日入院。有脓血便,无里急后重感,自觉左下腹隐痛不适,无咳嗽及咯血。入院体查:神志清,心肺听诊无异常,腹平软,肝脾肋下未触及,左中下腹可扪及一3ｃｍ×4ｃｍ肿块,可活动,边界清,有压痛,无移动性浊音,肠鸣音存在,肛 Patient, male, 69 years old. Due to changes in the shape of stool with the number of more than 1a, in August 24, 1999 admission. Have pus and blood stool, no sense of critical urgency, conscious left lower extremity pain and discomfort, no cough and hemoptysis. Admission physical examination: Consciousness, cardiopulmonary auscultation no abnormalities, abdominal soft, liver and spleen ribs untouched, the left lower abdomen can be palpable and a 3cm × 4cm mass, can move, the border clear, tenderness, no dullness of movement, intestinal Audible sound exists, anal