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. 2020 Sep 3;11:100. doi: 10.1186/s13244-020-00890-7

Fig. 13.

Fig. 13

Circumferential margin of resection involvement. a A T3d tumour invades the mesorectal fascia on the left side (arrow). b A 1–2 mm fat plane between this mrT3b low rectal cancer and the sphincter complex (arrow) is observed and as such the circumferential margin of resection may be considered free