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The greatest volume change occurs immediately after surgery (postoperative days 0-3) with no statistically significant volume change occurring up to 33 days after surgery for most patients. Therefore, there is no benefit of cavity shrinkage in waiting longer than the first 1 to 2 weeks to perform cavity SRS.

Good quality of resected specimens could be achieved with robotic LAR. Further prospective studies including long-term oncologic outcomes and costs with higher patient number are definitely needed to assess the benefits of robotic resection in rectal cancer treatment.

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