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Abstract #3698

Diagnostic value of adding MRI to CT examination for evaluating cystic renal masses using the 2019 Bosniak classification.

Yuki Arita1, Soichiro Yoshida2, Thomas C Kwee3, Hirotaka Akita1, Hiromi Edo4, Ryo Takeshita1, Haruka Okamura1, Misa Nagasaka1, Ryo Ueda5, Shigeo Okuda1, and Yasuhisa Fujii2
1Radiology, Keio University School of Medicine, Tokyo, Japan, 2Urology, Tokyo Medical and Dental University Graduate School, Tokyo, Japan, 3Radiology, University Medical Center Groningen, Groningen, Netherlands, 4Radiology, National Defence Medical College, Saitama, Japan, 5Radiation Technology, Keio University Hospital, Tokyo, Japan


We compared the interobserver agreement and diagnostic performance of CT alone and combined CT/MRI among two groups of readers (radiologists and residents) using the 2019 Bosniak classification (BC2019) to determine the malignancy of cystic renal masses (CRMs). Our study demonstrated that combined CT/MRI resulted in substantially high interobserver agreement between radiologists and residents. In addition, the diagnostic performance for category III/IV malignancy improved significantly for residents with combined CT/MRI when compared with evaluations based on CT alone. Thus, combined CT/MRI may be useful for diagnosing malignancy in CRMs, especially for non-expert readers, using the (BC2019).

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