Fig. 2
From: The Pros and cons of balloon dilation in totally ultrasound-guided percutaneous Nephrolithotomy

a Balloon dilation in case without hydronephrosis. b Short dilation inspected by nephroscope
From: The Pros and cons of balloon dilation in totally ultrasound-guided percutaneous Nephrolithotomy

a Balloon dilation in case without hydronephrosis. b Short dilation inspected by nephroscope