Page 488 - Withrow and MacEwen's Small Animal Clinical Oncology, 6th Edition

466 PART IV Specific Malignancies in the Small Animal Patient

In cats with small intestinal adenocarcinoma, there is signif- months. 444,461 For details about outcome after treatment for
icant perioperative risk, but cats that live beyond 2 weeks may alimentary lymphoma see Chapter 33, Sections A and B.
experience long-term control with surgery alone (Fig. 23.30).
VetBooks.ir In two series, all cats that did not have their tumors resected Large Intestine
After
There are various approaches for removal of tumors from the large
444,458
were euthanized or died within 2 weeks of surgery.
surgical resection, one-half of cats in one report and all cats intestine based on the size, location, and depth of penetration of
in another study died within 2 weeks of surgery, and 4 of 11 the mass. Generally, for rectal mucosal masses suspected to be
cats surviving beyond 2 weeks died within 2 months of com- benign polyps, the masses can be removed via mucosal eversion
plications or other nontumor causes. 444,458,462 For eleven of and submucosal resection. 535 Transrectal endoscopic removal of
the 12 cats that survived 2 weeks beyond surgery, mean ST benign canine rectal tumors can be considered if more extensive
was 15 months, although in another report the MST was 2.5 surgery is required because of the location of the tumor. Using
this technique, five of six dogs showed significant improvement
in quality of life and three dogs were cured; however, one dog
died due to rectal perforation, which is a known complication
of this procedure. 536 The other disadvantage of this technique
is there is often incomplete removal of the mass, as it is usually
removed piecemeal. In a recent case report, this technique was
modified to inject saline to separate the mucosa from the submu-
cosa to improve visibility and the ability to completely remove

A

• Fig. 23.29 Cecal gastrointestinal stromal tumor seen at exploratory lapa-
rotomy. Note the darkly colored perforated area of the tumor that led to
septic peritonitis in this dog. (Courtesy Dr. E. A. Maxwell, University of
Illinois, College of Veterinary Medicine.)

B

C
• Fig. 23.30 Intestinal obstruction as a result of adenocarcinoma (white
• Fig. 23.28 Intestinal lymphoma in a dog (A). The specimen is shown after arrow). Note the distention of the jejunum oral to the mass compared with
resection and anastomosis (B) and on cross-section (C) to illustrate the the normal diameter aboral to the mass. There is also an enlarged lymph
marked thickening of the bowel wall. (Courtesy Dr. Eric Pope, Ross Uni- node (black arrow). (Courtesy Dr. Eric Pope, Ross University, College of
versity, College of Veterinary Medicine.) Veterinary Medicine.)