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Dogs + Tumors

  • Systemic lymphoma is a very common cancer in dogs, but the cutaneous form is actually quite rare. Current statistics suggest that cutaneous lymphoma accounts for only about 5% of canine lymphoma cases.

  • The histiocyte group of cells are part of the body's immune surveillance system. Cutaneous (reactive) histiocytosis is an uncommon condition of dogs. Cutaneous, reactive histiocytosis is an immune dysfunction, mainly of young dogs and probably due to persistent antigenic stimulation by a variety of antigens (foreign proteins).

  • Cysts are hollow spaces within tissues that contain either a liquid or a solidified material; the contents may be a natural bodily secretion or an abnormal breakdown product.

  • Cytology is the microscopic examination of cell samples. These samples may sometimes be collected from the surface of the lesion under investigation, but more often, the sample is obtained by use of a special needle.

  • Tumors of the intestinal epithelial lining include non-cancerous polyps, benign adenomas and malignant epithelial tumors (adenocarcinomas). The polyps and adenomas may be multiple and cause local obstruction.

  • Muscle (called smooth muscle) and fibrous connective tissues form the framework (stroma) that holds other tissues together within the organs of the body. They enable these organs to contract and stretch as part of their function, for example in digestion of food.

  • Ear canal tumors can be benign or malignant. Diagnosis is typically via fine needle aspiration or tissue biopsy. The treatment of choice for ear canal tumors is surgical excision. For benign tumors, complete surgical removal is curative. With malignant tumors, a CT scan is often performed prior to surgery to determine how invasive the tumor is and enable surgical planning. Total ear canal ablation and bulla osteotomy (TECA-BO) is the most common surgical option. Radiation therapy or chemotherapy may be pursued.

  • These are tumors arising from structures within the eye. The most common intraocular tumors originate from the melanin producing cells (discussed in a separate handout).

  • Melanocytes are cells that produce a pigment called melanin. They are found in many parts of the body where there is pigment, particularly the skin, hair and eyes.

  • A 'tumor' is a lump. Some tumors are cancerous and some are benign. There are several different types of tumors that occur in the tissues around the eye. Many of these tumors have physical effects on the eye, causing soreness, redness and weeping. The most common treatment for tumors around the eye is surgical removal of the lump.

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