Nasopharyngeal Polyps: 3 Sign Groups and Imaging Timing

A cat under 2 years old that snores at rest, shakes its head and gags after eating may have a nasopharyngeal polyp — a benign inflammatory stalk that grows from the middle ear lining and pushes into the back of the throat. The signs come in 3 groups, nasal, aural and pharyngeal, and one cat can show all 3 at once. Imaging has 3 time points that matter: the sedated exam on day 0, a CT before surgery, and a repeat scan at 3 months if signs return.

Three sign groups, one stalk

Group 1 is nasal: stertor loud enough to hear across a room, snoring in both sleep and wakefulness, a one-sided then two-sided discharge, sneezing, and reduced airflow through 1 nostril. Group 2 is aural: head shaking, scratching at 1 ear, brown or yellow discharge that keeps coming back after 2 courses of drops, and a pink mass visible behind an intact eardrum. Group 3 is pharyngeal: gagging, reverse sneezing, a changed voice, dropping food after 3 to 4 chews, and weight loss of 5 to 10 percent over 4 to 8 weeks.

Middle ear involvement adds a fourth layer that owners rarely describe in those words: a head tilt of 10 to 30 degrees, nystagmus, a drooping eyelid or a retracted eyeball on 1 side. That pattern is covered in vestibular disease in cats, and a polyp is 1 of the few causes in a young cat that can be fixed.

Why young cats and why the back of the throat

Most polyps are diagnosed between 3 months and 2 years, though the range runs to 10 years. The stalk starts in the mucosa of the tympanic bulla or the Eustachian tube, grows 5 to 15 mm, and passes through the tube into the nasopharynx, where it fills the space behind the soft palate. A cat cannot breathe through the mouth and nose at the same time the way a dog does, so a 1 cm mass in that gap is a real airway problem rather than a nuisance.

Step 1: the sedated exam on day 0

Otoscopy plus a look behind the soft palate under deep sedation, not light sedation, because the palate must be retracted with a hook or a scope. This step takes 10 to 20 minutes, costs 150 to 300 dollars, and finds a smooth pink mass in most cases. A polyp that sits high and flat can be missed, which is why a negative exam in a cat with the right signs goes to imaging rather than to a wait-and-see.

Step 2: CT before surgery

CT of the head with 1 to 2 mm slices, bone window, is the reference standard: it shows the stalk, the bulla, and whether 1 or both ears are involved, which decides between a simple traction pull and a bulla procedure. Book it within 7 to 14 days of the first exam, and always before surgery. Cost runs 400 to 900 dollars and the scan itself takes 5 to 10 minutes under anaesthesia.

Two-view skull radiographs are the fallback where CT is unavailable: an open-mouth ventrodorsal view and a lateral view, 150 to 300 dollars. They show bulla opacity and soft tissue in the nasopharynx but miss small polyps and cannot separate a polyp from fluid.

Step 3: MRI only when the CT is unclear

MRI adds soft tissue detail for a mass that crosses the skull base or when a tumor rather than a polyp is possible. It takes 30 to 45 minutes under anaesthesia and costs 700 to 1,400 dollars, so it is a second-line test rather than a routine one. A cat with neurologic signs and a normal CT is the typical case for it.

Imaging and recheck timetable

Time point	Test	Detail	Minutes
Day 0 to 3	Sedated exam, otoscopy	Palate retracted, both ears	10 to 20
Day 3 to 14	CT head	1 to 2 mm slices, bone window	5 to 10
Day 3 to 14	Skull films	2 views if no CT	10 to 15
Week 2 after surgery	Exam only	Wound, breathing, appetite	10
Month 3	Repeat CT if signs	Same 1 to 2 mm protocol	5 to 10
Month 6 and 12	Exam, weight	Listen at rest, weigh	15

Keep the same slice thickness and the same scanner for the 3-month scan if you can. A 2 mm recurrence is easy to call on a comparison scan and easy to argue about on a scan taken with different settings.

Removal and the 3-month question

Traction with forceps through the mouth is quick and cheap, and recurrence is the trade-off; adding a ventral bulla approach lowers it at the cost of 1 to 2 nights in hospital and a 10 to 14 day cone. Most recurrences show up within 6 to 12 months, which is why the 3-month and 6-month visits carry more weight than the 12-month one. A cat that starts snoring again at week 6 needs a scan, not a second course of antibiotics.

What it costs and how to plan

A work-up with sedation, CT and surgery lands between 1,500 and 4,000 dollars at most practices, and a bulla procedure pushes the top of that range. The cost planner is where the 3 lines get added before the consult. Insurance usually treats this as a curable condition rather than a chronic one, so keep every invoice and the imaging report together.

When to go tonight

Open-mouth breathing at rest, a blue tinge to the gums, no food for 24 hours, or a bloody discharge that starts suddenly all mean the airway is compromised. A male cat that hides and stops eating needs the urinary check first, because the signs overlap and that one is fatal within 24 to 48 hours; the list is in urinary blockage signs. Once that is excluded, the polyp work-up can wait for morning.

Five steps after the first snore

• Record a 20 second video of the cat breathing at rest; it is worth more than a description.
• Ask for a sedated exam with the soft palate retracted, not just an ear look.
• Book CT within 14 days and take the scan to the surgeon before the operation is scheduled.
• Ask whether 1 or both bullae are involved, and whether traction alone is enough.
• Put the 3-month recheck in the calendar before you leave the hospital.

Terms mentioned in this article

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