Magnifying endoscopy in diagnosing early colorectal cancers and precancerous lesions / 中华消化内镜杂志

ABSTRACT

Objective To investigate the features of pit patterns by magnifying endoscopy on neo-plastic colorectal polyps. Methods The materials consisted of 129 polyps in 108 patients. Dye-assisted magnifying endoscopies were used to ascertain the pit patterns of polyps. Results Of 129 polyps, 106 were diagnosed pathologically as neoplastic lesions(adenomas and carcinomas) , in which 10 demonstratedⅡpit pattern with only mild to moderate atypia and no severe atypia; 73 ⅢL pit pattern; 1Ⅲs pit pattern; 7 Ⅳ pit pattern and 15 Ⅴ pit patterns which includes malignant change in 10 cases, and severe atypia in 5 cases. Ten lesions all demonstrated Ⅴ pit pattern were found to be carcinoma (7 mucosal and 2 submucosal and 1 advanced carcinomas). Of 7 mucosal carcinomas,6 showed ⅤA pit pattern,1 , Ⅴ N pit pattern; 2 submuco-sal carcinomas all showed VN pit pattern; 1 advanced carcinoma showed ⅤN pit pattern. Ten lateral sprea-ding tumors were also investigated, their pit patterns under magnifying endoscopy were Ⅲ LⅥor V pit pat-tern among them one case with malignant change. Conclusion The images of pit pattern obtained by magnif-ying endoscopy were essentially concordance to those provided by stereomicroscopy. The differentiation of tu-morous lesion or non-tumorous lesion can be fairly performed under the observation of pit patterns; it gives an important practical significance in diagnosing tumorous lesions.