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OBJECTIVE: We tried a new system for the evaluation of chronic sinusitis (CS) that uses a Computed tomography (CT) system equipped with the Ziostation 2 (Zio 2). SUBJECTS AND METHODS: Subjects were selected from patients with CS who had been evaluated using a CT system equipped with the Zio 2. Participants included 10 CS patients, 20 sides. The percentage of the volume of the soft-tissue density area relative to the total volume (STDA%) was calculated using Zio 2 system. We named this STDA% determined using the Zio 2 system the “Toho score.” Two doctors carried out these evaluations, and their results were compared. Toho score was compared with the Lund–Mackay (L-M) score. RESULTS: The Toho scores were correlated between the two doctors with significance (the correlation coefficients of total paranasal sinus area, 0.95). They were correlated with the corresponding L-M score values with significance, too (the correlation coefficients of total paranasal sinus area, 0.82). CONCLUSION: Toho system may be useful for accurately determining the extent of the inflammatory lesion in the paranasal sinus. In future, it can be employed effectively for monitoring treatment effects in chronic sinusitis and other conditions that involve inflammation of the paranasal sinuses.

The Toho Score: A New Evaluation System for Chronic Sinusitis Using Computed Tomography with Ziostation