A 9-year-old spayed female Golden Retriever presents with...

Hello, thank you for bringing this case forward. A 9-year-old Golden Retriever with epistaxis, facial swelling, and a confirmed nasal adenocarcinoma is a challenging diagnosis, but one where thorough staging is absolutely essential to guide our treatment strategy and provide a realistic prognosis. This is a locally aggressive tumor, and understanding its full extent is paramount.

Here are the staging diagnostics I would recommend prior to treatment planning:

Complete Blood Count (CBC), Serum Chemistry Panel, and Urinalysis (UA):

* Rationale: These are standard baseline diagnostics for any senior patient undergoing cancer treatment. They allow us to assess overall health, organ function (especially renal and hepatic), and identify any concurrent diseases. This provides crucial information for anesthetic planning (if radiation or surgery is pursued) and helps establish a baseline for potential chemotherapy side effects. We need to ensure she's otherwise healthy enough to tolerate therapy.

Thoracic Radiographs (3-Views):

* Rationale: Pulmonary metastasis is a significant concern for carcinomas. We need to obtain three orthogonal views (right lateral, left lateral, and ventrodorsal or dorsoventral) to maximize our ability to detect metastatic nodules. While radiographs have limitations (typically unable to detect nodules smaller than 5-8 mm), they are a critical first step in assessing for distant spread.

Computed Tomography (CT) Scan of the Head (with contrast):

Rationale: This is the most critical diagnostic for a nasal tumor. While the biopsy tells us what the tumor is, the CT tells us where it is and how extensive* it is. This advanced imaging will meticulously map the local tumor burden, which is vital for surgical planning (if applicable, though often not curative for nasal carcinoma) and absolutely indispensable for radiation therapy planning.
* What we're looking for:
* Extent of bone lysis (turbinates, nasal septum, maxilla, frontal bone).
* Involvement of the cribriform plate: This is a major prognostic indicator, as extension through the cribriform plate indicates intracranial involvement and significantly worsens prognosis.
* Extension into the frontal sinuses, orbit, nasopharynx, or subcutaneous tissues of the face.
* Any evidence of regional lymph node involvement (retropharyngeal lymph nodes are best assessed on CT).

Regional Lymph Node Aspiration (Mandibular and Retropharyngeal):

* Rationale: Although nasal carcinomas have a lower metastatic rate to regional lymph nodes compared to oral tumors or mast cell tumors, it is still possible. We should always aspirate the mandibular lymph nodes, even if they feel normal, as microscopic metastasis can be present. The retropharyngeal lymph nodes are harder to palpate but can often be evaluated and sampled with ultrasound guidance or during the CT scan. Cytology of any enlarged or suspicious lymph nodes is crucial.

Abdominal Ultrasound:

* Rationale: While less common for nasal carcinomas to metastasize to abdominal organs, a complete abdominal ultrasound provides a thorough assessment for any unexpected distant spread to liver, spleen, or other organs. Given her age and the nature of adenocarcinoma, it's a reasonable part of a comprehensive staging to rule out occult disease, though I would prioritize the head CT and thoracic radiographs.

The information gathered from these diagnostics will allow us to accurately stage the adenocarcinoma (e.g., using the WHO staging system for nasal tumors), provide a more precise prognosis, and, most importantly, formulate the most appropriate treatment plan tailored to her specific disease extent. This may involve definitive radiation therapy, palliative radiation, or comfort care, depending on the findings and the owner's goals. My goal is always to provide clarity and options, ensuring the best possible quality of life for your patient.