Rectal Cancer (Rectal Cancer) refers to the cancer between the dentate line and the junction of rectosigmoid colon, which is one of the most common malignant tumors in digestive tract.

Causes: The causes of rectal cancer are still very unclear, and its development is related to social environment, dietary habits, genetic factors and so on. Rectal polyps are also a high risk factor for rectal cancer.

Clinical manifestations
Early rectal cancer is mostly asymptomatic.
2. When rectal cancer grows to a certain extent, there will be changes in bowel habit, bloody stool, pus-blood stool, urgency, constipation and diarrhea.
3. Stool gradually becomes thin, and in the late stage, there is obstruction of defecation, emaciation and even malignant disease.
4、Urinary tract irritation, sacral and perineal pain, lower limb edema will occur when the tumor invades the bladder, urethra, vagina and other peripheral organs.

Preparation
Instrument preparation: Olympus laparoscope, ultrasonic knife.
Sterile items: basic kit, dissection kit, lc instrument, lc basic, puncture device, small puncture device, ultrasonic knife, purse-stringer, luminal bowel clamp × 2, large and small tissue clamp, high-definition beveled mirror.
General Consumables: suction tube, open electrosurgical knife, plasma drain × 2, small gauze × 3, large gauze, gauze, paraffin oil, 50 ml empty needle, mousse thread.
High-value consumables: 12mm perforator, YNQ, nail compartment (commonly used blue nails), 25 (28, 32) anastomosis, small, medium and large tissue clips, medium-sized incision protector, purse-string, 4-0 board needles, 3-0 absorbable threads, 0 absorbable threads, double needles, and anti-mucus solution.