Educational Articles

Tumors

  • This tumor is a disordered and purposeless overgrowth of modified sebaceous (sweat) glands known as the hepatoid glands. These glands only occur in dogs.

  • An insulinoma is a tumor that involves the beta cells of the pancreas. Beta cells are the cells that produce the hormone insulin. Insulinomas are surprisingly common in ferrets.

  • A keratoma is a rare benign tumor of the inner layer of keratin-producing epidermal hoof wall cells that forms inside a horse’s foot. As the tumor slowly grows, it expands and separates the hoof wall laminae, causing pain and lameness.

  • It is important to recognize that multiple tumors in the liver are not always cancers. The livers of older dogs may become nodular without causing any clinical effects.

  • The liver has a massive blood supply so many cancer cells from elsewhere arrive within it and start to grow. In dogs, metastatic tumors are three times as common as primary tumors and over 30% of malignant cancer may metastasize to the liver.

  • Most primary lung cancers originate from the epithelium lining the airways. In dogs, most develop in the alveoli where oxygen is taken up into the body, but in people and in cats most originate in the main airways (bronchi).

  • This is a tumor of the lymphatic vessels of the skin or subcutaneous tissue.

  • Lymph is a fluid that circulates in the body, transporting cells of the immune system (macrophages and lymphocytes) to sites where they are needed and draining areas where excess fluid or debris has accumulated, such as occurs with inflammation.

  • This is a tumor originating from cells of the mammary glands. In the cat, most mammary tumors are potentially or already malignant, so early surgical removal is important in preventing spread to other parts of the body (metastasis).

  • This is any tumor originating from the mammary gland tissues. In the dog, most tumors of this type are cured by complete surgical removal, but over time a few progress to malignancy and start to spread to other parts of the body (metastasis).