Head CT negative for acute bleed or mass.
 Head CT showed no hemorrhage 
(ROOT (S (VP (VB Head) (NP (NP (NNP CT)) (ADJP (JJ negative) (PP (IN for) (NP (JJ acute) (NP (VB bleed) (CC or) (NP (NN mass)))))))) (. .)))
(ROOT (S (S (VP (VB Head) (NP (NN CT)))) (VP (VBD showed) (NP (DT no) (NN hemorrhage)))))
( ( Head ( CT ( negative ( for ( acute ( ( bleed or ) mass ) ) ) ) ) ) . )
( ( Head CT ) ( showed ( no hemorrhage ) ) )