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From January 2008 to October 2009, 224 patients with renal calculi undergoing PCNL were randomized into two groups. Group 1 (112 patients) underwent PCNL using only fluoroscopy-guided renal access; while in group 2 (112 patients), US guidance for puncture was used in addition to fluoroscopy. The inclusion criteria were: normal renal functions, American Society of Anesthesiology scores 1 or 2, absence of congenital abnormalities, http://www.selleckchem.com/products/PD-0325901.html aged 15�C70 years, and anticipated single-tract procedure. The patients in both groups were matched for age, sex, and stone characteristics. The Student t-test was used for statistical analysis with an allowable error of 5%. The mean time to successful puncture was 3.2?min and 1.8?min in group 1 and group 2, respectively (P http://www.selleck.cn/products/JNJ-26481585.html were stone-free at the end of the operation. The hospital stay (2�C3 days) was same in both groups. There was no incidence of significant bleeding requiring transfusion during or after surgery. All the patients were followed-up for a ��6 months. US-guided puncture in PCNL helps in increasing accuracy of puncture and decreasing radiation exposure for the surgical team and the patients. ""Natural orifice transluminal endoscopic surgery (NOTES) is one of the most exciting concepts that has emerged recently in the surgical field. All accesses to the abdominal cavity in the porcine model using natural orifices, http://www.selleckchem.com/products/epz-6438.html e.g. transgastric, transvesical, transcolonic and transvaginal, have been described and explored. The experimental feasibility of all procedures by NOTES was successfully demonstrated in the porcine model using different types of natural orifices. However, few translations to the human have been made. NOTES is in a developmental stage and much work is still needed to refine techniques, verify safety and document efficacy. This paper is an update on the experimental foundation for NOTES and hybrid NOTES and examines the opportunities presented by this new surgical vision. Over the last few decades, the major drive in surgery has been the development and application of minimally invasive approaches to traditional operations. This philosophy has crossed all surgical specialties, and progressively in urology since the early 1990s the laparoscopic technique has been adopted for the majority of urological procedures [1].