1病例患者女，54岁，6月前出现排便习惯改变，便秘就诊。检查：肛诊在肛缘上8cm直肠左侧壁触及2cm×3cm×3cm大小，扁圆形，结节状肿块，质地硬韧，活动度较差。纤维结肠镜检见直肠左侧肛缘上8cml圆形隆起表面粘膜完整光滑，色泽略苍白，未发现结直肠其它病灶。用活检钳取活组? 1 case of female patient, 54 years old, appeared bowel habit change, constipation treatment. Examination: The rectal examination on the anal verge of 8cm rectal wall touched 2cm × 3cm × 3cm size, oblate, nodular mass, tough texture, poor activity. Fiber colonoscopy revealed that the mucosa of the 8cm round bulge on the left anal margin of the rectum was intact and smooth, and the color was slightly pale. No other colorectal lesions were found. Use biopsy forceps to take the live group?