Tumor biology and pathology.

The correct pathologic diagnosis of tumor type affecting the veterinary patient is of utmost importance to the veterinary surgical oncologist. The surgical oncologist may be presented with benign or malignant diseases, and an accurate pathologic diagnosis may be necessary to distinguish between the two conditions. In either case, assessment of surgical margins to determine completeness of surgical removal is necessary. In cases of malignancy, the pathologist should grade the tumor, if appropriate, and be able to perform specialized techniques, such as immunohistochemistry, if a diagnosis is in question. The surgical oncologist needs to understand the principles of tissue collection, fixation, and submission to help the pathologist provide an accurate diagnosis. Finally, the oncologic surgeon and surgical pathologist need to establish a cooperative working relationship and function as a team to discuss difficult cases. This will ensure the best treatment for the veterinary patient.