Case summary An 8-year-old cat was presented with recent signs related to upper airway obstruction.CT revealed a hypoattenuating mass, with rim enhancement, in the nasopharynx.Paracentesis yielded a viscous fluid, consistent with saliva on cytology.The sialocoele was aspirated, and surgical excision of the ipsilateral mandibular and sublingual salivary glands was performed.
The sialocoele recurred Horizontal Sensor 3 months later, associated with a polypoid structure in the auditory tube region.This was surgically extirpated.Histology was consistent with a tubulopapillar adenocarcinoma.Relevance and novel information To our knowledge, this is the first case report of a nasopharyngeal sialocoele with confirmed underlying 1964-1973 Convertible Top Boot Molding neoplasia in a cat, and the first description of CT imaging features of a nasopharyngeal sialocoele in a cat.