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Pathological ventilation of the maxillary sinus (MS) is one of the risk factors for the formation of chronic maxillary sinusitis. Purpose of study Is to evaluate the effectiveness of the method of restoring the medial wall of the MS with an autograft - a quadrangular cartilage of the nasal septum using the butterfly technique (Patent Application No. 2018140468, priority of 11/19/2018). Material and methods The study included patients who underwent septoplasty, endoscopic surgery on the MS with plasty of the medial wall of the MS (1st,