How does reno-bladder US confirms lithiasis dx?

- It confirms the clinical diagnosis of NC by objectifying (showing) a dilation of the pyelocaliceal cavities and / or the ureter (image). However, any dilatation does not mean obstruction (hypotonic sequelae (or sequential Hypotonia – both are correct) of an obstacle, bladder distention during the examination), and any obstruction does not immediately result in an expansion that can appear a few hours later (20 to 30% of the sudden obstructions on ureteral calculus are not identified (or objectified since the French document said objectivées). - It also describes the renal parenchyma, a thinning which can be explained by a chronic obstacle.