![]() FNA is not typically used to diagnose fibrosarcomas because, due to the nature of the tumor, it is difficult to aspirate the cells needed for identification. Generally no sedation is required for this procedure. Fine-needle aspiration (FNA): Using a syringe and needle, the veterinarian will penetrate the tumor and withdraw cells from within the tumor.There are different methods of sample collection that can be used to acquire these cells: ![]() To ensure an accurate diagnosis, microscopic examination of the cells of the tumor is required. There have been incidences of an aggressive form of fibrosarcoma in dogs under 1 year of age, and in these cases, the prognosis is usually poor.Īs these tumors are difficult to classify and are often thought of as a group, it is difficult to determine an accurate percentage of fibrosarcomas among diagnosed tumors. The tumors are often seen on the limbs but may be found on the trunk, as well. The overgrowth of cells is what results in a tumor.įibrosarcomas are seen most often in large-breed, middle-aged to older male dogs. With cancer, the injured or mutated cells begin to multiply at an accelerated rate. Examples of such factors are exposure to chemicals or radiation (carcinogens), infection, hormonal changes, and, more often seen in cats, certain vaccinations. The cause of these tumors is unknown but it is thought that cancer, in general, is the result of many contributing factors that cause genetic injury to cells. Neurofibromas, peripheral nerve sheath tumors, spindle cell tumors, schwannomas, and hemangiopericytomas are all names for fibrosarcoma-type tumors.Ĭause and Presentation of Fibrosarcoma Tumors Therefore, there are several different names in addition to fibrosarcoma that you may hear when this category of tumors is discussed. These tumors are difficult to classify and are often thought of as a group because of the parallel resemblance in their presentation. It is rare that fibrosarcomas metastasize (spread) to other parts of the body. While these tumors may be removed successfully, they frequently recur after surgery. Fibrosarcomas are slow-growing, malignant (cancerous) tumors most often found in the connective tissue of the skin and beneath the skin.
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