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Our Blogs

When to Get a CT Scan and Rhinoscopy for Your Pet: Nasal Signs & Symptoms

February 2, 2018

When your pet presents for nasal signs, your internal medicine specialist may recommend a CT scan and rhinoscopy to try to determine the cause for your pet’s signs. A CT scan and rhinoscopy is a diagnostic procedure and the patient’s problem will not be fixed or improved following the procedure.

Only in very rare cases, such as foreign objects and abnormal strictures in the nose, is a treatment for the problem performed simultaneously.

There are many signs that your pet may have, and these are not specific to any one particular disease process, but are very similar across all diseases that affect the nose. These signs may include sneezing, nasal discharge of any type (bloody, mucoid, clear), nasal congestion, snorting, gagging, or swelling of the nose or head. Occasionally cats will present with significant increase in respiratory effort when their nose is congested as they rarely open their mouth to breathe.

Diseases that can affect the nose include nasal cancers, fungal infections, anatomic abnormalities (both congenital and acquired), immune-mediated inflammation, foreign material in the nose, severe dental disease, allergic inflammation, viral infections, and rarely bacterial infections. Nose bleeds can occur in dogs and cats related to diseases outside the nose, so your veterinarian will likely recommend diagnostics such as clotting times, platelet count, blood pressure, and certain infectious disease testing prior to recommending a CT scan and rhinoscopy. Cats should have a blood test for Cryptococcus, a common fungal organism that affects the nose.

Basic health screening blood and urine tests will be recommended, as the procedure requires general anesthesia. Occasionally chest radiographs (x-rays) or an echocardiogram may be recommended as your pet’s condition dictates. General anesthesia carries some uncommon risks, including death, esophageal strictures, aspiration pneumonia, and strokes while under anesthesia. These are extremely uncommon and the highest quality monitoring is provided for your pet by a qualified veterinary technician. Our anesthesiologist is available on an as needed basis for critical patients requiring anesthesia.

A CT scan is an advanced imaging technique that allows for detailed three dimensional evaluation of boney (and some soft tissue) areas that are difficult to otherwise image. It allows the radiologist and internist to determine not only where in the nose is the problem located, but also gives some general idea of what the problem is. After the CT scan, if a space occupying mass (typically a cancer, but sometimes a fungal mass) is seen, a blind biopsy is performed with guidance from the CT scan so that the biopsy instrument is placed in the mass in order to get the best representative sample. If there is not a mass seen, or if the mass is in the very back of the nose, rhinoscopy will be performed to evaluate the nose and obtain samples of the nose. Rhinoscopy is performed with a small flexible fiberoptic scope and occasionally a small rigid scope that can be advanced through the nasal cavities of all but the smallest patients. The back of the nose is examined with the flexible scope, and then the throat is packed off with gauze sponges. The scope is then advanced through the nasal structures in a systematic fashion. In order to facilitate visualization through the mucous and blood that are inevitably, a constant running saline flush is utilized. Foreign material can be removed using a small grasping forcep, or may be flushed out during the examination. After a thorough evaluation, nasal biopsies are obtained.

After the procedure it is common to have some increased nasal congestion and bleeding due to biopsies and the presence of the scope. Nasal bleeding is not uncommon for several days following the procedure. Occasionally patients will spend the night to allow their family peace of mind and to keep the carpets clean. Patients can also be discharged that same night if the family would prefer.

Keep in mind that our procedures are scheduled with several services, and thus are subject to time change/delay. We will always try to keep to a scheduled time; however we may not have control over the start time. We will do our very best to keep you informed of significant delays in your pet’s procedure.

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