We agree with the reviewer that useful tools and techniques are available in different modalities and certainly surgeons dealing with various tumors utilize these as needed. We are fortunate to have access to this multi-modality image guided operating suite, and here we report on its use in specific rare tumors, chordomas and chondrosarcomas. We agree that the use of the PET-CT has no use in these cases, and we mentioned it only as part of the general introduction of the AMIGO suite. We addended the manuscript (line 260-264) as recommended
Thus it would be helpful for the authors to clarify this. The AMIGO suite has great capabilities, but when it comes to intraoperative imaging, it is CT and MRI scans that are made, and then using Brain Lab and possibly other software, that information is processed and redisplayed including 3D reconstructions.