Feline nasopharyngeal polyps can gro anywhere within the ear canal from just outside the ear drum (may actually be visualized using an otoscope, through the internal ear architecture (needs CT) into the back of the throat (may or may not be seen). CT is often required to diagnose nasopharyngeal polyps in cats, although they may be visualized within the ear canal or in the back of the throat, depending on their location. They can occur anywhere within the ear canal and associated anatomy, typically starting in the middle ear or Eustachian tubes (tube connecting ear to throat) and can extend into the nasopharynx (back of the mouth/throat above the soft palate) or even through the eardrum into the external ear canal. They can cause breathing issues, ear problems, or neurological signs depending on where they grow.
See https://veterinarypartner.vin.com/default.aspx?pid=19239&catId=254067&id=4952636
And,
https://vcahospitals.com/know-your-pet/nasopharyngeal-polyps-in-cats
And,
https://www.animalsurgicalcenter.com/nasopharyngeal-polyps–feline-inflammatory-polyps
This polyp, fortunately, was easily diagnosed with mild anesthesia:
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