If you dog or cat is a good candidate for surgery, then this will be discussed with you. If there are positive lymph nodes (i.e. spread), then these will be removed at the same time the anal sac tumour is removed too. The lymph nodes are in the abdomen, and it does require an open abdomen approach to remove them in most cases. There are minor risks associated with surgery that are specific to your pet, which will be discussed with you. The surgery to remove the anal sac tumour requires an incision in the skin a few cm’s away from the anus. Again, there are some minor risks with this that will be discussed.