Head CT negative. .
 CT is unremarkable 
(ROOT (S (VP (VB Head) (S (NNP CT) (ADJP (JJ negative)) (. .))) (. .)))
(ROOT (S (NP (NN CT)) (VP (VBZ is) (ADJP (JJ unremarkable)))))
( ( Head ( CT ( negative . ) ) ) . )
( CT ( is unremarkable ) )