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[Experience with using anisotropic gradient filtration of tomographic images in the roentgenological diagnosis of diseases of the paranasal sinuses].

Radio- and tomogrammes of 335 patients with inflammatory and tumoral pathology of accessory nasal sinus were investigated. Anisotropic gradient filtration of the image, carried out with "Magiskan-2" apparatus was used. The procedure permitted to distinguish small unobstrusive changes in sinal bony tissues, routinely unnoticeable, and characteristic features of shadow structure, facilitating a differential diagnosis of accessory nasal sinus diseases.