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A 23-year-old woman with rhinovirus-induced common cold and normal sinus radiograph on day 1 (A). On day 7 (B), the radiograph shows maxillary sinusitis (mucosal thickening over 5 mm in the right sinus), CRP less than 10 mg/L, ESR of 13 mm/hour, and WBC of 5.3 × 109/L. Symptoms disappeared within 14 days after onset of illness. On day 21 (C), mucosal thickening has resolved, but minor air-fluid level is seen in right maxillary sinus.
