Views: 1 Author: Site Editor Publish Time: 2023-01-10 Origin: Site
1. Colon barium enema examination
Especially, double - barium - air angiography is an important means to diagnose colorectal cancer. However, patients with suspected intestinal obstruction should be carefully selected.
2. B-ultrasound examination
Abdominal ultrasound examination can know whether the patient has recurrence and metastasis, which is convenient and quick.
3. CT examination
The purpose of CT examination is to determine the depth of invasion of the intestinal wall, the extent of the spread beyond the wall, and the site of distant metastasis. Currently, CT examination of colorectal cancer is mainly used in the following aspects:
1) To provide the staging of colorectal malignancies;
2) Recurrent tumors are found;
3) To evaluate the response of the tumor to various treatments;
4) Clarify the internal structure of intestinal wall and external compression lesions found by barium enema or endoscope, and clarify its nature;
5) To evaluate the abdominal mass found by barium enema, and to identify the source of the mass and its relationship with the surrounding organs;
6) Tumor location can be determined
4. MRI examination
MRI examination is as applicable as CT examination. MRI as a routine examination item for rectal cancer:
1) Preoperative staging of rectal cancer;
2) Evaluation of liver metastases in colorectal cancer;
3) Suspected peritoneal and subcapsular lesions
5. Transrectal cavity ultrasound examination
Endorectal ultrasound or endoscopic ultrasound is recommended as a routine examination for the diagnosis and staging of middle and low rectal cancer.
6. PET-CT
It is not recommended for routine use, but it can be used as an effective auxiliary examination for patients with complicated conditions that cannot be clarified by routine examination. Preoperative examination indicated that the tumor was at stage III or above, and it is recommended to use it in order to understand the distant metastasis.
7. Excretory urography
Preoperative routine examination is not recommended, and is only suitable for patients with large tumors that may invade the urinary tract.