Chapter 9 The gastrointestinal system/Fig 9.47.jpg

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(A) Rectum opened up to give a view of a stenosing cancer (arrow) at the rectosigmoid junction. Note the enlarged white nodes in the adjacent fat. Microscopy showed these to be largely replaced by metastatic carcinoma. (B) Transverse section through a total mesorectal excision for rectal carcinoma. The tumour presents as a raised plaque (large arrow). There is extension through the wall into perirectal fat. Margin involvement was confirmed microscopically in the region indicated by the small arrow. The patient was therefore referred for radiotherapy.