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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