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Thin slice CT examination of paranasal sinus in patient 1, 2 and 3 after operation: patient 1 (A–C), patient 2 (D–F), patient 3 (G–I), coronal (A, D, G), sagittal left (B, E, H) and right (C, F, I). The arrow indicates the opening of frontal sinus and the drainage channel of frontal recess.
