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Preoperative colonoscopy pathological diagnosis as cancer or can’t remove cancerization completely | |
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Lesion located on 8cm to 60cm from the anal verge | |
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The greatest transverse diameter is less than 4cm | |
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No local extensive infiltration and distant metastasis | |
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Body mass index (BMI) is less than 30 kg/m2 |
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With severe intestinal obstruction，perforation or bleeding needed emergency surgery | |
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Colorectal cancer recurrence or multiple primary cancer | |
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Laparoscopic surgery contraindications | |
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Case data is not complete or missing |
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Age | 岁 |
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Gender | |
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Body Mass Index | kg/㎡ |
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Distance from anal verge | cm |
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The greatest transverse diameter | cm |
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charlson weighted index of comorbidities，WIC | 分 |
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preoperative CEA | ng/ml |
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the American Society of Anesthesiologists(ASA)grade | 级 |
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preoperative tumor staging | 期 |
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previous abdominal surgery | |
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preoperative radiochemotherapy |
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Surgical time | min |
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Estimated bleeding during operation | ml |
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Time to first liquid diet | d |
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Postoperative exhaust time | d |
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Postoperative activity time | d |
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time to discharge | d |
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Serum levels of postoperative CRP | mg/L |
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Postoperation anal functional | 级 |
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rate of 30-day postoperative complication | |
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rate of utilization of painkillers in addition to postoperative analgesia pump | |
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Rate of readmission |
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the length of distal resection margin (DRM) | cm |
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the length of proximal resection margin (PRM) | cm |
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the rate of circumferential resection margin (CRM) involvement | |
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No. of harvested lymph nodes | 个 |