医学研究证明,大多数结肠癌来自息肉癌变。据报道,50岁以上人群中息肉的发病率约为50%,癌变率为3%～10%。结肠病变筛查是结肠癌的一级预防措施,通过筛查,早期发现并治疗结肠息肉,可降低结肠癌的发生率。王先生反复便血7年,以为是痔疮,并没有重视。最近半年来,王先生体重降了5公斤,隔几天就便秘,过几天又腹泻,偶尔左下腹还阵阵疼痛。一周前,王先生的腹部又开始疼痛,但这次疼痛难忍,只好到医院就诊。经过肠镜检查,王先生结肠内有一3×4厘米的息肉发生了恶变,遂立即进行了手术治疗。医生感叹,如果王先生及早就医,也许可以避免息肉 Medical studies have shown that most colon cancers result from polyposis. According to reports, the incidence of polyps in people over the age of 50 is about 50%, and the cancer rate is 3% to 10%. Screening for colon lesions is a primary prevention measure for colon cancer. Screening and early detection and treatment of colon polyps can reduce the incidence of colon cancer. Wang repeated bloody stools for seven years and thought that he was acne and he did not pay attention to it. In the past six months, Mr. Wang has lost 5 kilograms, constipation every few days, diarrhea in a few days, and occasionally pain in the left lower abdomen. One week ago, Mr. Wang’s abdomen began to feel pain again, but this time it was unbearable and he had to go to the hospital. After colonoscopy, there was a malignant transformation of Mr. Wang’s colon with a 3 × 4 cm polyp, and he had undergone surgical treatment immediately. The doctor lamented that if Mr. Wang visited the doctor early, he may avoid polyps.