( ( ( ( An inflammation ) ( of ( the ( white matter ) ) ) ) ( of ( the brain ) ) ) . )
(ROOT (NP (NP (DT An) (NN inflammation)) (PP (IN of) (NP (DT the) (JJ white) (NN matter))) (PP (IN of) (NP (DT the) (NN brain))) (. .)))
An inflammation of the white matter of the brain.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (DT the) (JJ gray) (NN matter)))) (VP (VBZ is) (PP (IN on) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT the) (NN brain))))) (, ,) (S (VP (VBG surrounding) (NP (JJ white) (NN matter))))) (. .)))