To see the outside of a kidney stone in three dimensions, an ultrasound is needed.
Kidney ultrasound is the test of choice for monitoring patients with stones, as it provides information about the size of the stone and its location within the kidneys. Renal cysts can also be visualized using ultrasound.
With this information, we can conclude that to see the outside of a kidney stone, in three dimensions, an ultrasound is necessary.
Learn more about Renal cysts in brainly.com/question/4170677