Table 1.

Summary of the main features of the miniaturized technologies currently available to treat urinary stones in children.

Terminology	Access sheath size	Nephroscope size	Reported stone-free rate
Standard-PCNL	22–30 Fr	24 Fr	>90.0% (4)
Mini-PCNL	11–22 Fr	12 Fr	80.6–97.1% (11–13)
Ultra-mini-PCNL	11–13 Fr	6 Fr	95.0% (15)
Micro-PCNL	4.85 Fr	0.9 mm	83.3–86.7% (18, 19)
Mini-micro-PCNL	8 Fr	0.9 mm	NA
Super-mini-PCNL	10–14 Fr	7 Fr	84.7–90.1% (22)

NA, data not available.