How is use of abdominal CT w/out contrast in lithiasis dx?

- It is a quick test, independent of the patient and the operator, but radiating. - ALL calculi are visible on the scanner, apart from the medical calculi (I asked a fellow French student about this sentence and apparently it is translated into exactly). CT without injection has a very high sensitivity (96%) and specificity (98%) for the diagnosis of urolithiasis and detects millimeter calculations. - In addition to the direct visualization of the calculus, other indirect signs can help in the diagnosis: dilation of the pyelocaliceal cavities, infiltration of the perirenal or peri-ureteral fat, thickening of the ureteral wall with next to (near) the calculi (rim sign)… (image 10). - In addition, the scanner makes it possible to measure the Hounsfield density/unit (HU) of the stones and thus to orient towards a particular composition of the calculi and to predict the effectiveness of the ECL