患者,女,32岁,已婚。大便习惯改变一年,腹泻与便秘交替出现,以腹泻为主,每次量少,次数多,伴里急后重,大便为粘液血便。体重减轻。月经史:15(1-2)/28,经量少,痛经。孕1产1。体检:营养中等,腹部未触到包块。肛指诊:距肛门口约7厘米处直肠前壁触及一包块,质硬、活动差,表面显结节状,包块上缘触诊不清。直肠镜 Patient, female, 32 years old, married. Stool habits change a year, diarrhea and constipation alternating to diarrhea, each less, more times, with tenesmus, stools for mucus bloody stool. Weight loss. Menstrual history: 15 (1-2) / 28, by the amount of less, dysmenorrhea. Pregnancy 1 production 1. Physical examination: medium nutrition, abdominal mass did not touch. Anal fingering: from the anorectal about 7 cm at the anterior rectal wall touched a mass of hard, poor activity, the surface was nodular, palpable palpable upper edge. Rectoscope