Abstract
Introduction
Linear array intraoperative ultrasound (lioUS) is an emerging technology for intracranial use. We evaluated sensitivity and specificity of lioUS to detect residual tumor in patients harboring a glioblastoma.
Methods
After near total resection in 20 patients, residual tumor detection using lioUS, conventional intraoperative ultrasound (cioUS), and gadopentetic-diethylenetriamine penta-acetic acid (Gd-DTPA)-enhanced intraoperative MRI (iMRI) were compared. Sensitivity and specificity were calculated based on 68 navigated biopsies. Receiver operator characteristic (ROC) curves and correlation with histopathological findings of each imaging modality were calculated. Additionally, results were evaluated in the subgroup of recurrent disease (23 biopsies in 8 patients).
Results
Sensitivity of lioUS (76 %) was significantly higher compared with iMRI (55 %) and cioUS (24 %). Specificity of lioUS (58 %) was significantly lower than in cioUS (96 %), while there was no significant difference to iMRI (74 %). All imaging modalities correlated significantly with histopathological findings. In the subgroup of recurrent disease, sensitivity and specificity decreased in all modalities. However, cioUS showed significant lower values than iMRI and lioUS. In ROC curves, lioUS showed a higher area und the curve (AUC) in comparison with iMRI and cioUS. We found similar results in the subgroup of recurrent disease.
Conclusion
Tumor detection using a lioUS is significantly superior to cioUS. Overall test performance in lioUS is comparable with results of iMRI. While, the latter has a higher specificity and a significantly lower sensitivity in comparison with lioUS.
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Conflict of interest
The Department of Neurosurgery was provided with a software plug-in and the hardware to integrate ioUS in the neuronavigation software for scientific use by Brainlab AG (Feldkirchen, Germany). RK has worked as a medical consultant for Brainlab AG (Feldkirchen, Germany). DRT received consultancies from Simon-Kucher and Partners (Germany), Covance Laboratories (UK), and GE-Healthcare (UK), received a speaker honorarium from GE-Healthcare (UK) and collaborated with Novartis Pharma Basel (Switzerland).
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Marian Neidert, Oliver Bozinov, Zurich, Switzerland
Coburger and colleagues present a prospective non-randomized single-center study (class IV) on the usefulness of intraoperative linear array ultrasound (lioUS) in glioblastoma surgery. In this study, lioUS was compared (first time) to high field ioMRI and to conventional ioUS. The authors conclude that lioUS is superior to cioUS in glioblastoma surgery and comparable with ioMRI (lioUS has a better sensitivity, but worse specificity).
Intraoperative ultrasound (ioUS) is often considered an “old” technology introduced in the 1960s that was not used frequently in neurosurgical practice over a long period of time due to suboptimal image quality. However, in recent years, ioUS had a comeback mainly because of technical improvements (reduced probe size allowing intracavital scanning, improved resolution with high-frequency probes, the option of 3D imaging and the option of linking ioUS to neuronavigation). Most importantly, ioUS offers true repetetive real time information, which is not the case with pure neuronavigation or in a delayed way with ioMRI or ioCT.
Regarding glioblastoma surgery, good evidence supports not only the idea of the extent of resection and the volume of residual disease but also new focal-neurological deficits following resection have a strong impact on patient outcome. As ioUS helps to differentiate between tumor and healthy brain tissue, ioUS can help in the balancing act of achieving a maximum resection while providing safety. Hence, the data provided in this manuscript are valuable to the neurosurgical community.
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Coburger, J., Scheuerle, A., Kapapa, T. et al. Sensitivity and specificity of linear array intraoperative ultrasound in glioblastoma surgery: a comparative study with high field intraoperative MRI and conventional sector array ultrasound. Neurosurg Rev 38, 499–509 (2015). https://doi.org/10.1007/s10143-015-0627-1
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DOI: https://doi.org/10.1007/s10143-015-0627-1