You have accessJournal of UrologyBladder Cancer: Non-Invasive I1 Apr 2016MP13-11 HIGH SPECIFICITY OF DIFFUSION-WEIGHTED MRI IN DIFFERENTIATING RESIDUAL BLADDER CANCER FROM POSTOPERATIVE CHANGES Yuki Nakamura, Soichiro Yoshida, Hiroshi Tanaka, Masaharu Inoue, Masaya Ito, Minato Yokoyama, Junichiro Ishioka, Yoh Matsuoka, Noboru Numao, Kazutaka Saito, Yasuhisa Fujii, and Kazunori Kihara Yuki NakamuraYuki Nakamura More articles by this author , Soichiro YoshidaSoichiro Yoshida More articles by this author , Hiroshi TanakaHiroshi Tanaka More articles by this author , Masaharu InoueMasaharu Inoue More articles by this author , Masaya ItoMasaya Ito More articles by this author , Minato YokoyamaMinato Yokoyama More articles by this author , Junichiro IshiokaJunichiro Ishioka More articles by this author , Yoh MatsuokaYoh Matsuoka More articles by this author , Noboru NumaoNoboru Numao More articles by this author , Kazutaka SaitoKazutaka Saito More articles by this author , Yasuhisa FujiiYasuhisa Fujii More articles by this author , and Kazunori KiharaKazunori Kihara More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2016.02.2492AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES In managing bladder cancer, the significant risk of residual cancer after initial transurethral resection of bladder tumor (TURBT) is a big concern, and repeat TURBT is recommended in selected patients. The ability of magnetic resonance imaging (MRI) to detect bladder cancer at diagnosis is excellent. However, differentiating residual cancer from changes after the initial TURBT remains challenging. Growing evidence has emerged showing the usefulness of Diffusion-weighted MRI (DW-MRI) as an imaging biomarker for characterizing the pathophysiology of bladder cancer. In this study, we evaluated the diagnostic ability of DW-MRI in parallel with T2-weighted MRI (T2W-MRI) and dynamic contrast-enhanced MRI (DCE-MRI) in differentiating residual cancer from postoperative changes after initial TURBT. METHODS Between January 2013 and August 2015, a total of 67 patients underwent repeat TURBT at our institute. Of these 67 patients, 25 who underwent high-quality multi-sequence MRI including DCE-MRI and DW-MRI after initial TURBT and prior to repeat TURBT were retrospectively evaluated in the current study. Two urologists independently interpreted the images. Bladder wall thickening on T2W-MRI, early enhancement on DCE-MRI, and high signal intensity on DW-MRI with a b-value of 1000 s/mm2 were assigned to positive findings. Discrepancies were resolved by consensus. In the 25 eligible patients, 32 lesions were histologically evaluated in repeat TURBT. We analyzed the diagnostic abilities of each imaging sequence. RESULTS The interobserver agreement was excellent for T2W-MRI (κ = 0.840) and DW-MRI (κ = 0.936), and good for DCE-MRI (κ = 0.784). Of the 32 lesions, 16 were confirmed histologically to be a residual cancer (pTa/T1/T2 = 2/6/8). The sensitivity/specificity/accuracy of T2W, DCE, and DW-MRI were 94/13/52%, 100/13/58% and 100/81/91%, respectively. The specificity/accuracy of DW-MRI were significantly higher than that of T2W-MRI (p < 0.01/p < 0.01) and DCE-MRI (p < 0.01/p < 0.01). CONCLUSIONS The feasibility of DW-MRI in differentiating bladder cancer from postoperative change after initial TURBT was shown. The findings of DW-MRI showing high specificity can be a useful adjunct for selecting patients who can avoid repeat TURBT. © 2016FiguresReferencesRelatedDetails Volume 195Issue 4SApril 2016Page: e138 Advertisement Copyright & Permissions© 2016MetricsAuthor Information Yuki Nakamura More articles by this author Soichiro Yoshida More articles by this author Hiroshi Tanaka More articles by this author Masaharu Inoue More articles by this author Masaya Ito More articles by this author Minato Yokoyama More articles by this author Junichiro Ishioka More articles by this author Yoh Matsuoka More articles by this author Noboru Numao More articles by this author Kazutaka Saito More articles by this author Yasuhisa Fujii More articles by this author Kazunori Kihara More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...