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Gastrointestinal Neoplasia in Cats

By: Dr. Bari Spielman

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Gastrointestinal neoplasia is cancer located anywhere throughout the gastrointestinal (GI) tract, including the oral cavity (mouth), esophagus, stomach, small intestines, large intestines, and rectum. GI neoplasia can be primary, which means it originates in the GI tract, or metastatic, which is spread from another site.

No specific causes of primary cancer have been identified, although it has been associated with several disorders. Chronic inflammation or irritation has been thought to be a contributing factor in some cases.

Cancer usually occurs in middle-aged to older cats. Depending on the tumor type and location, different breeds, ages, and species can be affected. Early in the illness, many individuals are asymptomatic, which means they do not show any clinical signs.

What to Watch For

With gastrointestinal cancer, clinical signs are largely dependent on the location of the cancer, size of the mass, and to a degree, the specific type of cancer. General signs to watch for by location include:

  • Oral. Watch for halitosis (bad breath), bleeding from the mouth, difficulty eating and drooling.

  • Esophageal. Watch for regurgitation, excessive salivation and weight loss.

  • Gastric (stomach). Watch for vomiting (with or without blood), weight loss, inappetence and black tarry feces.

  • Small intestinal. Watch for diarrhea, vomiting, weight loss, anorexia, black, tarry feces and gas.

  • Colonic (large intestinal). Watch for diarrhea (with mucus or blood), and straining to defecate.

  • Rectal. Watch for straining and blood in stool.

    Diagnosis

    Your veterinarian may recommend the following diagnostic tests:

  • Baseline tests to include a complete blood count (CBC), biochemical profile and urinalysis
  • Fecal examination
  • Abdominal radiographs (x-rays)
  • Thoracic (chest) radiographs
  • Abdominal ultrasound
  • Upper gastrointestinal contrast radiography (dye study)
  • Endoscopy of the upper and/or lower bowel and biopsy
  • Abdominal exploratory and biopsy

    Treatment

  • Hospitalization and support as needed, such as fluid therapy or blood transfusions
  • Surgical resection (removal), which is the treatment of choice
  • Surgical debulking (removing as much as possible) to help improve clinical signs
  • Chemotherapy
  • Radiation therapy
  • Dietary manipulation

    Home Care

    Administer medication and diet as directed by your veterinarian. Return for follow-up as directed by your veterinarian. If your pet has a recurrence of signs, contact your veterinarian at once.

    Prognosis varies depending on the location, size, type, and ability to remove the tumor surgically.

    There is no known specific prevention of gastrointestinal cancer. Treat all underlying inflammatory disorders in their early stages if possible.

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