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

Synopsis

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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