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Annular Colorectal Tumour

Posted by Anonymous


Can you please explain what Annular Colorectal tumours are?

Thank you


Posted by

Hi Annie,

Noticed you have no replies as yet, but the nurses are kept very busy.

I'm not a nurse or an expert but I'm fairly sure the term 'Annular' in this instance means ringlike or encircling -  Like the annular rings in trees ?

Hopefully when the nurse replies she can expand on this for you with regard to colorectal tumours.

G n' J

Ellen M-Macmillan
Posted by

Hi Annie,

Annular colorectal tumours describe how the colorectal tumour looks like on a scan. They look like encircling lesions that produce an "apple-core" or "napkin-ring" appearance.

They tend to be tumours that involve the distal or left side of the colon. Because of the position and shape of these tumours, the bowel lumen can become progressively constricted and narrowed, producing constipation, diarrhoea, or bowel obstruction in some cases.

The treatment for colorectal cancer would depend on the stage and grade of the cancer not how it looks on a scan.

Please don’t hesitate to get back in touch

Best wishes,

Ellen (Macmillan Information Nurse Specialist)