Head CT negative. .
 Subdural hematoma evident on CT
(ROOT (S (VP (VB Head) (S (NNP CT) (ADJP (JJ negative)) (. .))) (. .)))
(ROOT (NP (NP (JJ Subdural) (NN hematoma)) (ADJP (JJ evident) (PP (IN on) (NP (NN CT))))))
( ( Head ( CT ( negative . ) ) ) . )
( ( Subdural hematoma ) ( evident ( on CT ) ) )