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In patients with sinusitis, nasal obstruction and purulent discharge from the maxillary sinus are frequently observed. Mostly, it responds to antibiotic treatment. But in case of not responding, although fungal infection is a rare entity, we have to consider fungal sinusitis. We recently experienced a case of acute aggravation of fungal maxillary sinusitis after zygomaplasty. Endoscopic sinus surgery was performed and foreign materials were observed inside the right maxillary sinus. They were gauzes,which had been used during previous surgery. Intraoperative examination demonstrated a dark brown,cheese-like material in the sinus. After surgery, the patient's symptoms disappeared gradually. The culture examination identified the surgical sample to be Trichosporon asahii. So we reported with a review of literature.