A 0.4 cm kidney stone is obstructing the renal pelvis outlet, causing mild to moderate blockage of the urinary tract. Which method is most suitable for removing this stone?

Explanation

For small stones around 0.4 cm causing mild to moderate obstruction, Extracorporeal Shock Wave Lithotripsy (ESWL) is the preferred non-invasive technique to break and remove the stone. More invasive options like open surgery or nephrolithotomy are generally reserved for larger or complicated stones.