Laparoscopic Right Hemicoloectomy for Right Colon Cancer With a Medial-to-lateral Approach Orientated by SMA or SMV

Inclusion Criteria:

* Patients suitable for curative surgery between 18 - 85 years old;
* American Society of Anesthesiologists(ASA) grade I-III;
* Preoperative pathological diagnosis of adenocarcinoma;
* Tumor located at the right colon;
* Informed consent;
* No history of familial adenomatous polyposis, ulcerative colitis or Crohn's disease.

Exclusion Criteria:

* Pregnant patient;
* History of psychiatric disease;
* Use of systemic steroids;
* Simultaneous multiple primary colorectal cancer;
* Preoperative enhanced CT scan of chest, abdominal and pelvic cavity shows:

  1. Tumor involves the surrounding organs and combined organ resection needed to be done;
  2. distant metastasis;
  3. unable to perform R0 resection;
* History of any other malignant tumor in recent 5 years;
* Patients need emergency operation: mechanic ileus, perforation.
* Not suitable for laparoscopic surgery (i.e., extensive adhesion caused by abdominal surgery, not suitable for artificial pneumoperitoneum, etc).
* Conversion from laparoscopic surgery to laparotomy;