Modern minimally invasive tumor treatment is divided into the following three aspects: (1) laparoscopic surgery In the treatment of colorectum, laparoscopic resection of colon cancer, rectal cancer resection and liver lobectomy are now available. (2) Minimally invasive reform of traditional surgery. (3) Others Vascular intervention, radiofrequency therapy, microwave therapy, ultrasonic focused therapy, photodynamic therapy, argon helium knife therapy, radioactive particle implantation, etc. In the treatment of colorectal cancer, ultrasound intervention occupies an important position (see the table below). Types of minimally invasive treatment for colorectal cancer and the scope covered by ultrasound intervention Laparoscopy Vascular intervention Ablation therapy Other Primary foci resection Hepatic artery embolization chemotherapy Chemical ablation of hepatic metastases (anhydrous ethanol injection, acetic acid injection, etc.) Bile drainage Puncture biopsy Abdominal lymph node dissection Portal vein embolization chemotherapy Physical ablation of hepatic metastases (radiofrequency, microwave, argon helium knife, laser, etc.) Paracentesis and drainage of encapsulated effusion Renal pelvis in case of urinary tract obstruction Fistulae Liver metastases resection (lobectomy) Laser and photodynamic therapy Superficial lymph nodes and abdominal masses 125I particle brachytherapy Note: The part in bold is the area covered by ultrasound intervention