Bosniak Classification version 2019: validation and comparison to original classification in pathologically confirmed cystic masses

To evaluate Bosniak Classification v2019 definitions in pathologically confirmed cystic renal masses. Seventy-three cystic (≤ 25% solid) masses with histological confirmation (57 malignant, 16 benign) imaged by CT (N = 28) or CT+MRI (N = 56) between 2009 and 2019 were independently evaluated by three blinded radiologists using Bosniak v2019 and original classifications. Discrepancies were resolved by consensus with a fourth blinded radiologist....