Colorectal Polyps

Posted by e-Medical PPT
A lesion which projects into the lumen of the bowel.
Size of a few mm to several cm in diameter.
Single or multiple. In polyposis syndrome hundreds may be found
Larger polyps are found in the rectum
5% may contain invasive carcinoma at discovery
The type of cell that forms the polyp varies and is important in determining its potential for developing into a cancer
Most polyps are asymptomatic until they grow to 2cm in diameter
They can lead to bleeding, frank blood or microscopic bleeding (presenting with anaemia)
Polyps rarely present with a change in bowel habit – but large polyps in the rectum can present with tenesmus.
A large amount of mucus can also be passed.
Rarely a polyp will prolapse through the anus or act as an apex for an intussception.

Classification of polyps
Metaplastic (90%)
Adenomatous (~10%)
    Familial adenomatous polyposis (FAP)
    Gardeners syndrome
Hamartomatous
    Juvenile
    Peutz-Jeghers Syndrome
    Cowden Syndrome
Protrusions of mesenchymal tissue
    Lipomas/leiomyomas/neurofibromas/haemangiomas
Inflammatory polyps
    Pseudopolyps in Ulcerative colitis   
  


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