What is the Ultrasound appearance of renal calculi?
Renal calculi are very common and one of the most common causes of urinary tract obstruction.
Renal calculi are detected sonographically as echogenic foci with posterior acoustic shadowing.
In addition, most urinary tract calculi demonstrate a twinkling artifact with color and power Doppler imaging, which is the presence of color behind a strongly reflecting interface without real flow.
Calculi <5 mm in size may be sonographically occult.