I wish your friend well,
Risks: Death, anastamotic leak, infection of the wound, bleeding from the site, and narrowing of outlet due to scarring are the common ones. Side effects depend on the type of surgery for the tumor and then reconstruction:
a) No side effects noteworthy b) Narrowing of the "joints" c) Anemia and other nutritional problems, like weight loss d) DVT of the leg veins if not ambulated early
It is very common after these operations for patient's to lose their appetite and feel full quickly after eating small amounts, especially initially after surgery. Most patients may lose 10-15 lbs. That being said, as the body adapts, eating habits and appetites return to normal and the weight is regained.