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. 2022 Nov 23;9:1011846. doi: 10.3389/fsurg.2022.1011846

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© 2022 Marengo, Di Perna, Baldassarre, Cofano, De Marco, Zeppa, Petrone, Ajello, Garbossa and Zenga.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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An occipitocervical fusion was planned after endoscopic endonasal removal of the lesion. A preoperative planning of C2–C3 pedicle screws was reproduced. The 3D-printed guides were manufactured considering values of sagittal plane angle (SAL or SAR) and transverse plane angle (TAL or TAR) of screws, horizontal and vertical distances, screw directions and angulations and their entry points (A, C); C2 and C3 3D planning were shown (B, D).