Endoscopy is an important means of detecting and diagnosing early colorectal cancer. In the past 30 years, with the popularity of endoscopes and the improvement of their technical level, as well as the development of various endoscopic instruments, the discovery and diagnosis of early colorectal cancer has become possible.
Enlarged endoscope (also known as enlarged endoscope): The mucosal image can be magnified more than 100 times, and the colon cancer opening is changed repeatedly on the right.
Dyeing endoscopy: Nearly commonly used rouge, methylene blue as a wine agent (usually sprayed with 1% blue-blue liquid). Diagnosis of inflammatory lesions, micropolyps and polyp carcinogenesis through the distribution of pigments.
Combined with magnifying endoscopy and stained endoscopy, it can be observed that the early colorectal cancer mucosal gland opening is grooved and irregular, which is helpful for detecting early disease.
Endoscopic ultrasound: The location, extent and depth of the tumor can be determined by endoscopic ultrasound. It is generally believed that super-endoscopy can determine the accuracy of tumor depth by more than 80%, and can also determine the presence or absence of lymph node and distant organs. This helps to improve the detection rate and preoperative diagnosis rate of early colorectal cancer, and is of great significance for improving the prognosis of colorectal cancer.
CT colonoscopy; this is a CT imaging technique for imaging data from various angles of the colon, ie, two-dimensional and three-dimensional.
In recent years, due to the clinical application of stained endoscopy and magnifying endoscopy, and the use of EMR or EMPR for total resection of small lesions in early colorectal cancer, the detection rate of early colorectal cancer is significantly improved, and the medical treatment is cured. The effect of the 5-year survival rate of colorectal cancer is significantly improved. However, in China, these new methods have not been widely used in clinical practice. Therefore, improving the endoscopic diagnosis and treatment of endoscopists and using new methods to identify small intestinal lesions is the key to the early development of colorectal cancer.