The mirroring technique: a navigation-based method for reconstructing a symmetrical orbit and cranial vault.

Abstract

The reconstruction of orbital structures and the cranial vault curvature can be challenging after trauma or wide resections for tumors. Sophisticated methods have been developed recently, but these are resource- and time-consuming. We report the mirroring technique, which is an effective and costless application for navigation-guided reconstruction procedures. At the time of the reconstruction, high-resolution images are reloaded while forcing a left-right axial flip. The pointer subsequently enables a virtual 3-dimensional projection of the position of the contralateral normal anatomy. This method was applied successfully in 2 cases of en plaque sphenoid wing meningiomas with secondary exophthalmia. The mirroring technique represents an accurate method of outlining the contralateral normal anatomy onto the pathological side based on navigation guidance.