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A video demonstration of three-dimensional imaging to assess the circumferential resection margin in locally advanced rectal cancer and recurrent rectal cancer - a video vignette I Dear Editor, i Surgical treatment of locally advanced primary rectal cancer and locally recurrent rectal cancer often requires extensive approaches to achieve a tumour-free resection margin (R0). After chemoradiotherapy, the presence of tumour cells, signs of fibrosis or mucin pools are considered to be associated with previous invasion by the tumour. [Extracted from the article]