Inanloo SH, et al. - The feasibility, safety and efficacy of ultrasound-guided percutaneous nephrolithotomy in flank position were evaluated. In the current work, ultrasonography-guided percutaneous nephrolithotomy demonstrated comparable outcomes with the conventional percutaneous nephrolithotomy and non-association with radiation exposure. Moreover, in some patients including those with obesity or cardiopulmonary comorbidities, anesthesia in the flank position could be less harmful.