Bone Arches: Performance of Pseudo-scanner Sequences in Segmenting the Extent of the Tumour and in Planning Surgical Resection Using the CT Scan as a Reference

The management of bone sarcomas is complex, and imaging plays an important role in both diagnosis and treatment monitoring. MRI is the method of choice to provide accurate information on the extent of the bone tumor and its relationship to adjacent soft tissues. However, an additional CT scan is routinely performed and combined with MRI images (spatial realignment) using software and relying on manual control and/or correction. This is essential during surgical planning to i) ensure resection with properly defined safety margins and ii) allow for accurate bone reconstruction.ing. This exploratory interventional study aims to evaluate the performance of "pseudo-scanner" MRI sequences in delineating the tumor extent within bone sarcomas and its ability to serve as a reference for designing cutting guides and enabling "navigation" during the surgical procedure, thus exploring the possibility of replacing the scanner to minimize exposure to ionizing radiation in patients with sarcoma.