A new method of uni- and bilateral osteoplastic approach to the frontal sinus is discussed. The operation starts with the inspection of the frontal sinus cavity through its inferior wall. If the surgeon states that it is not possible to control the pathologic process by this route, the anterior frontal sinus wall together with the soft tissues of the forehead is temporarily turned up as an osteoplastic flap. In the operation discussed the access to the frontal sinus and the floor of the anterior cranial cavity is similar to that in the operation of Riedel, but without leaving any deformity of the forehead. The above method may be indicated especially (1) in the obliterative surgery of large frontal sinuses, (2) in traumatic lesions of the sinuses with involvement of the anterior cranial cavity.
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