This operation is normally only carried out nowadays in cases of emergency if there has been a damage of the bowel, either by disease, or trauma.
The operation normally involves removing the lower part of the large bowel (Shown as A). The upper part is brought out through the abdomen wall normally on the right hand side to the surface this is called a Colostomy.
The output from the remaining colon is then collected in a colostomy bag which is attached to the outside of the abdomen wall. The other end of the bowel (Shown as B) toward the rectum/back passage is then closed with stitches and left inside the abdomen.
Depending on the reason for your operation this may be temporary to allow the bowel to rest and heal or permanent in certain cases.
You’re Stoma Nurse or Consultant will discuss this with you in more detail.