Can early rectal cancer be detected by color Doppler ultrasound?

The cause of rectal cancer is still not very clear. Its onset is related to social environment, eating habits, genetic factors, etc. Rectal polyps are also a high-risk factor for rectal cancer. It is generally recognized that excessive intake of animal fat and protein and insufficient intake of dietary fiber are high-risk factors for rectal cancer. So, can early rectal cancer be detected by color Doppler ultrasound?

1. Rectal examination is a necessary step in diagnosing rectal cancer. About 80% of rectal cancer patients can be found through rectal examination. A hard, uneven mass can be felt; in the late stage, the intestinal cavity can be narrowed and the mass can be fixed. The finger cot can be seen with dirty pus and blood containing feces.
2. Colonoscopy After the digital rectal examination, a colonoscopy should be performed to assist in diagnosis under direct vision, observe the shape of the mass, the upper and lower edges, and the distance from the anal edge, and take the mass tissue for pathological section examination to determine the nature of the mass and its degree of differentiation. For cancer located in the middle and upper rectum, which cannot be touched by fingers, sigmoidoscopy is a better method.
Generally, a digital examination can provide a preliminary diagnosis of rectal cancer, and a colonoscopy can confirm the diagnosis. Color Doppler ultrasound is generally not a routine means of detecting rectal cancer. If there is blood in the stool or a change in bowel habits, it is best to do a digital examination.