The tumor is called a villous adenoma and is a form of polyp.

In areas of villous adenoma some of the tumour cells also showed nuclear immunoreactivity (Fig 2).

A malignant villous adenoma was removed from Ronald Reagan when he was President in 1985.

He had a 14 cm circumferential villous adenoma but no focus of malignancy was detected on repeated biopsies.

A villous adenoma can cause a change in bowel habits such as constipation, diarrhea and mucus in the stool.

On July 12, 1985, President Ronald Reagan underwent a colonoscopy, during which a pre-cancerous lesion called a villous adenoma was discovered.

A pathologist at the hospital said no evidence of cancer was found in the 66 slices of the tumor, known as a villous adenoma, that were examined under a microscope.

Uncommon causes include gastrinoma, medullary thyroid carcinoma (which produces excess calcitonin), factitious diarrhea from laxative abuse and villous adenoma.

Villous adenoma is a type of polyp that grows in the colon and other places in the gastrointestinal tract and sometimes in other parts of the body.

The patient with a villous adenoma had a very extensive lesion which was initially 14 cm long and it was a notable success to control his troublesome rectal discharge at all.

One of these was a 2 cm diameter tubulovillous adenoma exhibiting severe dysplasia, and the other was an 8 cm diameter villous adenoma that had undergone focal malignant change.

The statement did not say how much bowel was removed from the 72-year-old Pope, but it is standard for surgeons to cut out a wide area of bowel on either side of a benign villous adenoma to prevent a recurrence.

Seven patients (four women and three men, ages ranging from 40 to 73 years) had a variety of non-malignant conditions, including three with diverticular disease, two with villous adenoma, one with arteriovenous malformation, and one with rectal prolapse.

Eleven of these patients had rectal or rectosigmoid adebicarcinoma (including one with cancerous change in a villous adenoma), one had direct rectal invasion from cervical cancer, and one an extensive villous adenoma (with no documented focus of adenocarcinoma).