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Case summary   A 3-year-old male neutered domestic shorthair cat presented for further investigation of a swollen left eyelid and a hard, non-painful bony swelling over the left frontal sinus. Physical examination revealed no nasal discharge or airflow through the left nostril. A CT of the head revealed a left frontal sinus obstruction with expansile remodelling and osteolucency. Drainage of the frontal sinus obstruction was alleviated via placement of a temporary polyvinylchloride (PVC) stent that was left in place for 6 weeks. Purulent material removed from the frontal sinus returned a positive culture for Pseudomonas aeruginosa susceptible to marbofloxacin that was continued for 4 weeks, and for an additional 2 weeks after stent removal. A left-sided mucoid nasal discharge returned 3 months after removal of the stent. Repeat CT performed 20 months after surgery found the presence of a gas-filled frontal sinus and partial resolution in the amount of fluid within the mid and rostral nasal cavity. A repeat positive culture for P aeruginosa was also obtained. The exact cause of the chronic unilateral sinonasal obstruction remains unclear, but an underlying chronic rhinitis with secondary obstructive frontal sinusitis or sinus mucocoele with secondary nasal extension was suspected.Relevance and novel information   Chronic rhinosinusitis in cats can be a challenging condition to treat and cure. This case illustrates the partial resolution of chronic unilateral sinonasal obstructive disease in a cat using a temporary PVC stent.

Partial resolution of chronic unilateral sinonasal obstructive disease in a cat using a temporary polyvinylchloride stent