The pain appeared localized mostly to his back without any radiation.
 the patient has back pain
(ROOT (S (NP (DT The) (NN pain)) (VP (VBD appeared) (VP (JJ localized) (S (ADVP (RB mostly)) (VP (TO to) (VP (PRP$ his) (ADVP (RB back) (PP (IN without) (NP (DT any) (NN radiation))))))))) (. .)))
(ROOT (S (NP (DT the) (NN patient)) (VP (VBZ has) (ADVP (RB back)) (NP (NN pain)))))
( ( The pain ) ( ( appeared ( localized ( mostly ( to ( his ( back ( without ( any radiation ) ) ) ) ) ) ) ) . ) )
( ( the patient ) ( ( has back ) pain ) )