Oral Masses & Tumors in Dogs & Cats
Oral tumors are the fourth most common cancer in dogs and the third most common in cats. Many oral masses are malignant, and their behavior and prognosis depend heavily on the tumor type, location, and extent of bone involvement. Standard oral examination and dental X-rays cannot adequately assess the full picture.
At Sage Veterinary Imaging, CT scanning provides comprehensive evaluation of oral masses, revealing the full extent of bone invasion, soft-tissue margins, and regional lymph node status — the information oncologists and surgeons need to plan the most effective treatment.
SVI offers advanced ct services at our centers in Round Rock, Texas; Spring, Texas; and Sandy, Utah.
Oral Tumors at a Glance
Oral Tumors in Dogs & Cats
Oral tumors in dogs and cats encompass a wide range of tumor types with very different behaviors and prognoses. In dogs, malignant melanoma is the most common malignant oral tumor, followed by squamous cell carcinoma and fibrosarcoma. Acanthomatous ameloblastoma, while locally aggressive, is considered benign because it does not metastasize.
In cats, squamous cell carcinoma (SCC) is the most common oral tumor, often arising from the gums or under the tongue. Feline oral SCC is particularly aggressive and carries a guarded prognosis. Fibrosarcomas are the second most common feline oral malignancy.
The extent of bone involvement is one of the most important factors in treatment planning for oral tumors. Tumors confined to soft tissue are often amenable to surgery, while extensive bone invasion may require mandibulectomy or maxillectomy — or may shift the recommendation toward radiation or palliative care. CT provides the objective assessment of bone involvement that is essential for these treatment decisions.
Signs & Symptoms of Oral Tumors
Oral tumors may be discovered during routine dental exams or when owners notice changes in their pet’s eating behavior. Many oral tumors grow rapidly and become advanced before clinical signs are obvious.
⚠ Don’t Delay Evaluation
Oral tumors in dogs and cats are frequently malignant and grow quickly. Any visible oral mass, unexplained bleeding from the mouth, or new facial swelling should be evaluated promptly. Earlier diagnosis typically means more treatment options and better outcomes, especially for tumors that have not yet invaded bone.
How CT Evaluates Oral Tumors
CT is the standard of care for staging oral tumors because it reveals the information that directly drives treatment decisions: bone invasion, surgical margins, and regional lymph node status.
What Our 128-Slice CT Reveals
Bone invasion extent — CT precisely maps bone lysis and periosteal reaction in the mandible, maxilla, and hard palate. The extent of bone invasion determines whether mandibulectomy/maxillectomy is feasible and what margins are required.
Soft-tissue mass extent — Contrast-enhanced CT defines the tumor’s soft-tissue boundaries, showing involvement of the tongue, floor of mouth, palate, and surrounding muscles. This guides surgical approach and helps predict whether clean margins are achievable.
Regional lymph node assessment — CT evaluates mandibular and retropharyngeal lymph nodes for enlargement and abnormal enhancement patterns, which helps stage the cancer and determine whether lymph node sampling is indicated.
Nasal cavity and orbit assessment — For maxillary tumors, CT shows whether the mass extends into the nasal cavity or orbit, which significantly affects treatment options.
Chest staging — CT of the thorax can be performed in the same anesthesia session to screen for pulmonary metastasis, providing complete cancer staging in a single visit.
CT vs. Other Imaging for Oral Tumors
CT
Gold standard. Reveals bone invasion, soft-tissue extent, lymph node involvement, and enables surgical planning with 3D reconstructions.
Dental X-Ray
Shows local bone changes but limited field of view. Cannot assess deep soft-tissue extent, lymph nodes, or provide the full picture needed for staging.
MRI
Superior soft-tissue contrast but less bone detail. May be used as a complement for tongue or pharyngeal tumors. CT remains the primary study.
Which Breeds Are Most at Risk?
Breeds at Higher Risk
For malignant melanoma: Cocker Spaniels, Miniature and Toy Poodles, Scottish Terriers, and Golden Retrievers are predisposed. Dogs with pigmented oral mucosa may have higher rates. Chow Chows, German Shepherds, and German Shorthaired Pointers have higher rates of oral fibrosarcoma. In cats, any breed can be affected, but Domestic Shorthairs are most commonly diagnosed.
What to Expect During Oral CT
Oral CT scans take approximately 10–15 minutes under general anesthesia, with pre- and post-contrast images obtained for optimal tumor characterization. If chest staging is performed simultaneously, total scan time is approximately 15–20 minutes. Biopsy may be performed under the same anesthesia.
Results are interpreted by a board-certified veterinary radiologist the same day. The report includes detailed assessment of bone involvement, soft-tissue extent, lymph node status, and staging information. 3D reconstructions may be generated for complex surgical planning, particularly for mandibulectomy or maxillectomy cases.
Why Choose Sage for Oral Tumor Diagnosis
Schedule Oral Tumor Imaging
If your pet has an oral mass, facial swelling, or unexplained oral bleeding, CT imaging provides the staging information needed to plan the most effective treatment.
Oral Tumor Imaging FAQ
Get Answers for Your Pet
An oral mass needs a definitive diagnosis and staging. CT imaging provides the complete picture needed to plan the most effective treatment for your pet.