Diagnostic Performance of Whole-Body Diffusion-Weighted Imaging Compared to PET-CT Plus Brain MRI in Staging Clinically Resectable Lung Cancer

  • Usuda, Katsuo (Department of Thoracic Surgery, Kanazawa Medical University) ;
  • Sagawa, Motoyasu (Department of Thoracic Surgery, Kanazawa Medical University) ;
  • Maeda, Sumiko (Department of Thoracic Surgery, Kanazawa Medical University) ;
  • Motono, Nozomu (Department of Thoracic Surgery, Kanazawa Medical University) ;
  • Tanaka, Makoto (Department of Thoracic Surgery, Kanazawa Medical University) ;
  • Machida, Yuichiro (Department of Thoracic Surgery, Kanazawa Medical University) ;
  • Matoba, Takuma Matsui Munetaka (Department of Radiology, Kanazawa Medical University) ;
  • Watanabe, Naoto (Department of Radiology, Kanazawa Medical University) ;
  • Tonami, Hisao (Department of Radiology, Kanazawa Medical University) ;
  • Ueda, Yoshimichi (Department of Pathophysiological and Experimental Pathology, Kanazawa Medical University) ;
  • Uramoto, Hidetaka (Department of Thoracic Surgery, Kanazawa Medical University)
  • Published : 2016.06.01


Background: Precise staging of lung cancer is usually evaluated by PET-CT and brain MRI. Recently, however, whole-body diffusion-weighted magnetic resonance imaging (WB-DWI) has be applied. The aim of this study is to determine whether the diagnostic performance of lung cancer staging by WB-DWI is superior to that of PET-CT+brain MRI. Materials and Methods: PET-CT + brain MRI and WB-DWI were used for lung cancer staging before surgery with 59 adenocarcinomas, 16 squamous cell carcinomas and 6 other carcinomas. Results: PET-CT + brain MRI correctly identified the pathologic N staging in 67 patients (82.7%), with overstaging in 5 (6.2%) and understaging in 9 (11.1%), giving a staging accuracy of 0.827. WB-DWI correctly identified the pathologic N staging in 72 patients (88.9%), with overstaging in 1 (1.2%) and understaging in 8 patients (9.9%), giving a staging accuracy of 0.889. There were no significant differences in accuracies. PET-CT + brain MRI correctly identified the pathologic stages in 56 patients (69.1%), with overstaging in 7 (8.6%) and understaging in 18 (22.2%), giving a staging accuracy of 0.691. WB-DWI correctly identified the pathologic stages in 61 patients (75.3%), with overstaging in 4 (4.9%) and understagings in16(19.7%), giving a staging accuracy of 0.753. There were no significant difference in accuracies. Conclusions: Diagnostic efficacy of WB-DWI for lung cancer staging is equivalent to that of PET-CT + brain MRI.


Lung cancer;staging;whole body diffusion-weighted magnetic resonance imaging;MRI;PET-CT


Supported by : Ministry of Education, Culture, Sports, Science and Technology, Japan


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