A polyp is an abnormal growth of tissue (tumor) projecting from a mucous membrane. If it is attached to the surface by a narrow elongated stalk it is said to be pedunculated. If no stalk is present it is said to be sessile. Polyps are commonly found in the colon, stomach, nose, sinus(es), urinary bladder and uterus. They may also occur elsewhere in the body where mucous membranes exist like the cervix and small intestine.
Colon polyps are uncommonly associated with symptoms. Occasionally rectal bleeding
, and on rare occasions pain
may occur because of colon polyps. Colon polyps are a concern because of the potential for colon cancer
being present microscopically and the risk of benign colon polyps transforming with time into colon cancer. Since most polyps are asymptomatic
, they are usually discovered at the time of colon cancer screening with either digital rectal exam (DRE)
, flexible sigmoidoscopy
, Barium enema
or virtual colonoscopy
. The polyps are routinely removed at the time of colonoscopy either with a polypectomy snare
(P.Deyhle, 1970) or with biopsy forceps
. If an adenomatous polyp
is found with flexible sigmoidoscopy
or if a polyp is found with any other diagnostic modality
, the patient must undergo colonoscopy
for removal of the polyp(s). Even though colon cancer
is usually not found in polyps smaller than 2.5 cm, all polyps found are removed since the removal of polyps reduces the future likelihood of developing colon cancer
. When adenomatous
polyps are removed, a repeat colonoscopy
is usually performed in three to five years.
Most colon polyps can be categorized as sporadic.
Inherited Polyposis Syndromes
Non-inherited Polyposis Syndromes
Types of colon polyps
An endometrial polyp or uterine polyp is a polyp or lesion
in the lining of the uterus (endometrium
) that takes up space within the uterine cavity. Commonly occurring, they are experienced by up to 10% of women. They may have a large flat base (sessile
) or be attached to the uterus by an elongated pedicle
). Pedunculated polyps are more common that sessile ones. They range in size from a few millimeters to several centimeters. If pedunculated, they can protrude through the cervix
into the vagina
. Small blood vessels may be present in polyps, particularly large ones.
A cervical polyp is a common benign
polyp or tumor
on the surface of the cervical canal
. They can cause irregular menstrual
bleeding but often show no symptoms. Treatment consists of simple removal of the polyp and prognosis is generally good. About 1% of cervical polyps will show neoplastic
change which may lead to cancer
. They are most common in post-menstrual
women who have given birth.