Today's Veterinary Practice

MAR-APR 2018

Today's Veterinary Practice provides comprehensive information to keep every small animal practitioner up to date on companion animal medicine and surgery as well as practice building and management.

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PEER REVIEWED 66 IMAGING ESSENTIALS cecocolic intussusceptions are the most common types. An ileocolic intussusception is seen within the ascending and transverse colon. A cecocolic intussusception is short and localized to the area of the cecum and proximal ascending colon. A colocolic intussusception involves the colon only. Malignant Neoplasms Large intestinal neoplasms are not as common as small intestinal neoplasms. Adenocarcinoma 25 and lymphoma are most common large intestinal tumors in cats; other large intestinal tumors include mast cell tumor and hemangiosarcoma. Adenocarcinoma and leiomyosarcoma are most common large intestinal tumors in dogs. Intestinal adenocarcinoma affects the cecum, colon, and mid-to-distal rectum of dogs. This intestinal neoplasia appears nodular, pedunculated, and may cause annular constriction. Ultrasonographically, these neoplasms appear as circumferential transmural thickening with loss of normal intestinal layering ( FIGURE 9 ). Lymphoma commonly affects the cecum and colon in dogs. Mast cell tumors can produce focal or diffuse wall thickening of the colon of cats. 16,17 Leiomyosarcomas are considered the second most common canine intestinal tumor and the most common intestinal sarcoma in dogs. 26 Leiomyosarcoma causes large, eccentrically located, single or multiple, hypoechoic or anechoic area(s) of wall thickening. 27 They have a low incidence of developing in the cecum and colon ( FIGURE 10 ). 28 Leiomyosarcoma is uncommon in the cat. FIGURE 8. Long axis (A) and short axis (B) views of the colon of a cat diagnosed with a colocolic intussusception secondary to a colonic wall mass. Note the multilayered appearance of the colon and the hyperechoic mesentery within the center (). The intussuscipiens ( white arrows ) and intussusceptum ( white arrowheads ) can be distinguished from one another. A B FIGURE 9. Long axis view of the colon of a dog diagnosed with adenocarcinoma. Note the overall thickened wall ( calipers ), loss of layering, and hypoechoic appearance. FIGURE 10. Long axis view of the colon of a dog diagnosed with a colonic leiomyosarcoma. Note the pedunculated, heterogeneous, eccentrically located mass associated with the wall of the colon ( calipers ).

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