The specimen shows a short length of rectum. A 5cm sessile tumour is present on the mucosa. The
tumour has a fine papillary surface. There was no microscopic evidence of invasion of the bowel
This man, aged 72, gave a history of altered bowel habits for three to four months. Rectal
examination revealed the tumour. The histology of the lesion is that of a villus adenoma; the
appearances are described as "delicate villus processes covered tall mucous-secreting columnar
epithelium". To be classed as an adenoma adenomatous polyp, the epithelium would have to have
shown dysplasia (either low grade or high grade dysplasia).