( Diseases ( of ( the ( urinary system ) ) ) )
(ROOT (NP (NP (NNS Diseases)) (PP (IN of) (NP (DT the) (JJ urinary) (NN system)))))
Diseases of the urinary system
(ROOT (S (NP (JJ Kidney) (NNS stones)) (VP (VBP are) (VP (VBN considered) (NP (NP (DT a) (NN disease)) (SBAR (WHNP (WDT that)) (S (VP (VBZ affects) (NP (DT the) (JJ urinary) (NN system)))))))) (. .)))