Multiphase CT Deep Learning for Bosniak II-III Renal Cysts

This retrospective study combine radiomics and deep learning models to predict malignancy in Bosniak II-III cystic renal masses, aiming for improving preoperative risk assessment and reducing unnecessary surgery for benign lesions and avoiding delayed treatment of malignant disease. The main question it aims to answer is: * How to specially predict malignancy in Bosniak II-III cystic renal masses？ The investigators retrospectively included patients diagnosed with Bosniak II-III cystic renal masses based on preoperative contrast-enhanced CT.