Changes

===Clinical Signs===

===Clinical Signs===

Dogs and cats present with a history of gastrointestinal signs. Tumours of the small intestine are associated with vomiting, weight loss, melaena, flatulence and borborygmus, and large intestinal adenocarcinoma can cause haematochezia with tenesmus and mucous. Constricting lesions in the distal tract may also change the shape of the faeces passed. Other signs reported in either form include anorexia, diarrhoea and signs associated with acute intestinal obstruction or perforation and peritonitis.

Dogs and cats present with a history of gastrointestinal signs. Tumours of the small intestine are associated with vomiting, weight loss, melaena, flatulence and borborygmus, and large intestinal adenocarcinoma can cause haematochezia with tenesmus and mucus. Constricting lesions in the distal tract may also change the shape of the faeces passed. Other signs reported in either form include anorexia, diarrhoea and signs associated with acute intestinal obstruction or perforation and peritonitis.

Small intestinal adenocarcinomas may be palpable transabdominally as a mid-abdominal mass. Distended loops of small intestine may also be palpated, and rectal examination may reveal melaena. A mass may be palpated per rectum in large intestinal adenocarcinomas. This may present as a constriction or as nodular lesions protruding into the lumen. Bright red blood may be discovered on rectal examination.

Small intestinal adenocarcinomas may be palpable transabdominally as a mid-abdominal mass. Distended loops of small intestine may also be palpated, and rectal examination may reveal melaena. A mass may be palpated per rectum in large intestinal adenocarcinomas. This may present as a constriction or as nodular lesions protruding into the lumen. Bright red blood may be discovered on rectal examination.

Various paraneoplastic syndromes have been associated with intestinal adenocarcinoma, including cutaneous disease and hyperviscosity syndromes.

Various paraneoplastic syndromes have been associated with intestinal adenocarcinoma, including cutaneous disease and hyperviscosity syndromes.

Differential diagnoses for intestinal adenocarcinoma include: intestinal foreign body, inflammatory bowel disease, alimentary lymphoma, gastrointestinal parasitism, leiomyoma or meiomyosarcoma and pancreatitis.

Differential diagnoses for intestinal adenocarcinoma include: intestinal foreign body, inflammatory bowel disease, alimentary lymphoma, gastrointestinal parasitism, leiomyoma or leiomyosarcoma and pancreatitis.

===Laboratory Tests===

===Laboratory Tests===