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To retrospectively assess the experience of day-surgery semi tubeless ultra-mini percutaneous nephrolithotomy (UMP) for the treatment of kidney stones by experienced surgeons. Clinical data of 358 patients with kidney stones (254 males and 104 females; mean age 59.60±11.7 who were performed UMP surgery in Shanghai Jiao Tong University School of Medicine affiliated Renji Hospital from June 2015 to December 2018. Patient demographics, operative data, complications, and readmission rates were recorded. Day-surgery UMP was defined as discharge of patients eit