Chronic nasal discharge in cats: 75 cases (1993-2004)

To identify the most common etiologic diagnosis and any historical, physical, or other diagnostic variables associated with a definitive etiologic diagnosis for chronic nasal discharge in cats. Design-Retrospective case series.

75 cats with nasal discharge of >/= 1 month's duration.

Medical records of affected cats were reviewed for information on signalment, clinical signs, duration and type of nasal discharge, results of clinical examination, laboratory findings, and advanced imaging findings.

A specific etiologic diagnosis for nasal discharge was identified in only 36% of cats. Neoplasia (carcinoma or lymphoma) was the most common etiologic diagnosis. Character and location of nasal discharge did not contribute greatly toward a specific etiologic diagnosis. Sneezing and vomiting were the most common concurrent clinical signs. Routine CBC, serum biochemical panel, and urinalysis did not contribute to a specific etiologic diagnosis. An etiologic diagnosis was more likely in older cats and cats that underwent advanced imaging studies and nasal biopsy.

Although advanced diagnostic testing, including imaging studies and biopsy, increases the likelihood of achieving an etiologic diagnosis, the cause of chronic nasal discharge in cats often remains elusive.