( ( If ( you ( ( did not ) ( have ( x-rays ( since ( your surgery ) ) ) ) ) ) ) ( , ( ( your doctor ) ( ( may ( ( ask ( for ( ( an ultrasound ) ( of ( the kidneys ) ) ) ) ) ( to ( look ( for ( old ( or ( new stones ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP you)) (VP (VBD did) (RB not) (VP (VB have) (VP (VBN x-rays) (PP (IN since) (NP (PRP$ your) (NN surgery)))))))) (, ,) (NP (PRP$ your) (NN doctor)) (VP (MD may) (VP (VB ask) (PP (IN for) (NP (NP (DT an) (NN ultrasound)) (PP (IN of) (NP (DT the) (NNS kidneys))))) (S (VP (TO to) (VP (VB look) (PP (IN for) (NP (JJ old) (CC or) (JJ new) (NNS stones)))))))) (. .)))
If you did not have x-rays since your surgery, your doctor may ask for an ultrasound of the kidneys to look for old or new stones.
(ROOT (S (NP (DT The) (NN option) (S (VP (TO to) (VP (VB remove) (S (NP (NN kidney) (NNS stones)) (ADJP (JJ other) (PP (IN than) (NP (NN surgery))))))))) (VP (VBZ is) (NP (NN ultrasound) (NNS treatments))) (. .)))