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About

Masanori Hasegawa is a leading urologic surgeon and researcher whose work centers on optimizing outcomes in robot-assisted prostate and kidney surgery. His major contributions lie in identifying precise, patient-specific factors that predict surgical difficulty and postoperative recovery. In his highly cited 2020 study (27 citations), Hasegawa demonstrated that psoas muscle volume significantly influences the development of inguinal hernia after robot-assisted radical prostatectomy, highlighting the role of sarcopenia in surgical complications. Another key paper (21 citations) systematically analyzed what factors affect operative time, providing practical benchmarks for surgical planning. Hasegawa’s research is distinguished by its temporal granularity: he has shown that predictors for urinary continence recovery vary at different time periods following prostatectomy, enabling more tailored patient counseling. He has also innovated by introducing tumor contact surface area as a novel predictor for collecting system entry during partial nephrectomy, refining the widely used R.E.N.A.L. nephrometry score. With a growing body of work that bridges surgical technique, patient physiology, and recovery trajectories, Hasegawa’s findings directly inform preoperative risk stratification and help surgeons improve both intraoperative efficiency and long-term quality of life for their patients.