A mast cell tumor (MCT) is a type of tumor consisting of mast cells. Mast cell tumors can form nodules or masses in the skin (and other organs), and cause enlargement of the spleen and intestine. Most mast cell tumors are seen as firm plaques or nodules in the skin. If your cat has the splenic form of the disease, the most commonly observed signs are weight loss, vomiting, and loss of appetite. The intestinal form, depending on how severe the disease is, may cause vomiting, diarrhea, fresh red blood in the stool, or black/tar-colored stool. This cancer is typically diagnosed via fine needle aspiration or biopsy. Surgical removal of the mass is the treatment of choice. Radiation therapy may also be suggested.
A mast cell tumor (MCT) is a type of tumor consisting of mast cells. Mast cell tumors most commonly form nodules or masses in the skin, they can also affect other areas of the body, including the spleen, liver, intestine, and bone marrow. MCTs are particularly common in Boxers, Bull Terriers, Boston Terriers, and Labrador Retrievers. This cancer is typically diagnosed via fine needle aspiration. This tumor's behavior is complex and depends on many factors. Despite the range in behavior and prognoses, MCTs are actually one of the most treatable types of cancer. Depending on the grade, surgery, chemotherapy, and/or radiation therapy are treatments for MCTs.
Melanocytes are cells that produce a pigment called melanin. A melanoma is an abnormal production of these cells in a dysregulated manner that forms a nodule, mass, or other form of lesion. Melanomas of the skin may develop anywhere on the body and are not typically bothersome. Toe melanomas, however, can be much more painful and concerning for your pet's health. Melanomas are often black in color but some do not produce pigment (amelanotic melanoma). Fine needle aspiration or biopsy may be used for diagnosis. Melanomas of the skin and toes are treated surgically and radiation therapy may be discussed.
The phrase 'multidrug resistance mutation 1 (MDR1)' refers to a specific mutation that can occur at a gene known as the MDR1 gene, also known as the ABCB1 gene. Many herding breeds (most commonly Collies and Australian Shepherds) have a mutation at the MDR1 gene that makes them more sensitive to the negative effects of certain medications.
The two most common nasal tumors are nasal adenocarcinoma and nasal lymphoma. Clinical signs range from mild to severe, and may include respiratory distress, hemorrhage, and neurological problems. Staging is always recommended before primary therapy is pursued. Radiation therapy is usually pursued for localized disease. Chemotherapy is usually pursued for systemic disease.
Neuroendocrine tumors are a group of tumors that develop from the cells of the neuroendocrine system, and include insulinomas, gastrinomas, glucagonomas, carcinoids, medullary thyroid carcinomas, small-cell lung carcinomas, pheochromocytomas, chemodectomas, and Merkel cell carcinomas. Some of these tumors are functional, while others are non-functional. The signs of disease in dogs and cats depend on the type of growth, location of the tumor, its size, the degree of infiltration in the surrounding tissues, whether it has metastasized, and whether it is functional. A definitive diagnosis requires tissue biopsy and histopathology, often with histochemical staining and electron microscopy. Staging is highly recommended for these tumors. Treatment may involve surgery, chemotherapy, radiation therapy, and medical and dietary management.
Peripheral odontogenic fibroma (formerly known as fibromatous and ossifying epulis) is a benign, often slow-growing tumor that arises from periodontal structures. They can be further sub-classified as peripheral odontogenic fibromas and acanthomatus ameloblastomas. These tumors do not spread to other organs; however, extension to surrounding tissues is common. Treatment is dependent on size and location of the tumor. If surgery cannot be performed, radiation therapy is an excellent alternative for ameloblastomas given their high degree of response to radiation therapy.
Oral squamous cell carcinomas (SCC) are the most common oral tumor in cats, and second most common in dogs. These tumors are locally aggressive, with a possibility to metastasize. Regardless of the location of SCC, surgery is the typically the standard treatment. Radiation therapy may be recommended following surgery or as a primary treatment for palliative care. Staging is recommended for all cases. If metastasis is present chemotherapy is often pursued.
Oral fibrosarcomas are the third most common oral tumor in dogs. These tumors arise from the connective tissues of the oral cavity. They are locally aggressive with a low tendency to metastasize. Staging is recommended for oral tumors, and CT imaging is advised for planning treatment, whether surgical or radiation. These tumors may also affect the nasal cavity. Treatment involves surgical removal of the tumorous tissue. Radiation therapy may also be recommended.