Diagnostic Value of Nasal Cytology in Chronic Rhinosinusitis Assessed by a Liquid-based Cytological Technique.

Back ground: Nasal cytology has generally been employed as a useful diagnostic tool in the differentiation of rhinopathies. Objective The aim of this study was to assess the extent and diagnostic value of inflammation of nasal and paranasal sinus mucosa in chronic rhinosinusitis patients by employing a combination of nasal brushings and a liquid-based cytological technique. Methods Forty-eight patients with chronic sinusitis and 20 control subjects without any sign of sinusitis undergoing endoscopic surgery, although not all underwent endoscopic sinus surgery, were recruited to the study. Nasal cytology samples were collected from all subjects using nasal brush and processed a liquid-based cytological technique for evaluation of total and differential inflammatory cell counts. Biopsies were also taken from the inferior turbinates from its anterior margin in all subjects and from identical lateral maxillary sinus mucosa in patients with chronic sinusitis during surgery and routinely processed for staining and evaluation of inflammatory cells. Results Total and individual inflammatory cell counts in nasal brushings were significantly correlated with the respective inflammatory cell counts in biopsies obtained from the inferior turbinate (eosinophils: r = .519 and P = .016; neutrophils: r = .540 and P = .012; lymphocytes: r = .540 and P = .011) but not in biopsies obtained from the maxillary sinus. No correlation was observed between the inflammatory cells in biopsies from the inferior turbinate and biopsies from the maxillary sinus. The liquid-based cytological technique showed higher sensitivity (94.1%), specificity (76.9%), and positive predictive value (84.2%) for inflammation in the inferior turbinates than for inflammation in the maxillary sinus (sensitivity = 63.4% and positive predictive value = 63.4%). Conclusion Nasal cytology evaluated by use of nasal brushings processed by a liquid-based cytological technique is likely to have higher diagnostic value for the inflammatory response in noninfectious rhinitis than in chronic rhinosinusitis.