A 38 y.o. woman complains of a purulent discharge from the left nostril. The body temperature is 37,5°C. The patient is ill during a week and associates her illness with common cold. Pain on palpation of her left cheek reveals tenderness. The mucous membrane in the left nasal cavity is red and turgescent. The purulent exudates is seen in the middle meatus in maxillary. What is the most probable diagnosis?