Evaluation of Diagnostic Accuracy of the Approved Tumor Mapping Protocol in Grading of Glial Tumors

  • Nahid Sadighi Advanced Diagnostic and Interventional Radiology Research Center (ADIR), Tehran University of Medical Sciences, Tehran, Iran.
  • Sima Fallah Arzpeyma Department of Radiology, Razi Hospital, Guilan University of Medical Sciences, Rasht, Iran.
  • Mohsen Izanlou Department of Radiology, Razi Hospital, Guilan University of Medical Sciences, Rasht, Iran.
  • Mohamad Ali Oghabian Department of Medical Physics, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran.
  • Mostafa Izanlou Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
  • Fateme Noori Department of Obstetrics and Gynecology, Alzahra Hospital, Guilan University of Medical Sciences, Rasht, Iran.
  • Saeid Sadeghi Joni Department of Radiology, Razi Hospital, Guilan University of Medical Sciences, Rasht, Iran.

Abstract

Objective: Evaluation of Diagnostic Accuracy of the Approved Tumor Mapping Protocol in Grading of Glial Tumors.
Methods: This descriptive cross-sectional study was performed on patients aged 2 to 82 years with glial tumor. Patients were referred to the hospital for tumor mapping and underwent imaging with simultaneous methods of MRS and magnetic resonance (MR) perfusion and conventional MRI under the supervision of NIAG group. Then, the results of the second evaluation, including the ratios of the desired metabolites and the amount of blood flow, permeability of the target area were compared with the results of pathology. The results were analyzed by SPSS software version 24.
Results: In this study, 30 patients were included. Sensitivity, specificity, positive and negative predictive value for the determination of high-grade glioma with peripheral/internal rCBV were 100/100%, 100/93%, 93/100% and 100.100%, respectively. Sensitivity, specificity, positive and negative predictive value for the diagnosis of glioma by using peripheral/internal rCBV and thresholds of 2.65 and 1.06 were 100/100%, 93/100%, 93/100% and 100/100%, respectively. Sensitivity, specificity, positive predictive value and negative predictive value were determined for diagnosis of high-grade glioma tumor using Ch + Cr / NAA Cho / Cr and Cho / NAA ratios with detection threshold of 2.97 (93.3%), 3.5 (78.9%,100%, 100%, and 73.3%), and 2.1 (100%). Threshold values of 3.5, 2.1 and 2.97 were obtained using Cho / Cr, Ch + Cr / NAA and Cho / NAA, respectively, for the detection of high-grade gliomas. The combination of rCBV, Cho / Cr, Ch + Cr / NAA and Cho / NAA had sensitivity, specificity, positive and negative predictive value of 67.7%, 80%, 77% and 70.5%, respectively. Significant differences in rCBV and Cho / Cr, Cho / NAA and NAA / Cr ratios were observed between low- and high-grade gliomas (P <0.0001).
Conclusion: Preoperative grading of glioma based on routine MR imaging is often unreliable. As a result, measuring rCBV and Cho / Cr and Cho / NAA ratios independently and somewhat together can significantly improve the sensitivity and predictive values of preoperative glioma grading.
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Published
2020-11-06
How to Cite
SADIGHI, Nahid et al. Evaluation of Diagnostic Accuracy of the Approved Tumor Mapping Protocol in Grading of Glial Tumors. Journal of Contemporary Medical Sciences, [S.l.], v. 6, n. 5, nov. 2020. ISSN 2413-0516. Available at: <http://www.jocms.org/index.php/jcms/article/view/844>. Date accessed: 25 nov. 2020. doi: https://doi.org/10.22317/jcms.v6i5.844.