The outcomes of inspection of 89 patients with extensive tumours of paranasal sinuses by the methods of CT and MRI were analyzed. The growing and extension of tumours goes by a penetration or germination of the tumours to adjacent tissues and anatomic structures. The problem of differentiation of these processes is stipulated by necessity of planning and choice of adequate access and volume of surgical interference in patient’s treatment. The superposition of the clinical symptomatics of MRI and CT images ensures an elimination of the wrong positive conclusions and hyperdiagnostics.
