A general rule in paediatric endourology is ’the smallest instrument is best’.  With the OES Pro Paediatric Urology System, Olympus sets a new benchmark in both dimensions and versatility of use.  The complete line-up includes a thin percutaneous nephroscope which also can be used as compact cystoscope, working elements, a resectoscope and an optical urethrotome.  In addition, the paediatric percutaneous nephroscope also can be used as a mini nephroscope for adults.