Reply by the authors

摘要

We appreciate the interest and congratulations of the authors of this letter to the editor. The aim of our study was evaluation of long-term renal functional outcome of percutaneous nephrolithotomy (PNL) for calculi in solitary kidneys by measuring the differences in preoperative estimated glomerular filtration rate (eGFR) values and those during follow-up.1 The authors of this letter are raising another important question. What is the best imaging protocol for evaluation of the stone-free status after PNL in patients with solitary kidneys? This is crucial in patients with solitary kidneys because it was reported that residual fragments of 5 mm or less after PNL should be expected to require active intervention in one-third of the patients at intermediate follow-up.