( ( Three tumors ) ( ( arose ( from ( preexisting ( basal ( cell adenomas ) ) ) ) ) . ) )
(ROOT (S (NP (CD Three) (NNS tumors)) (VP (VBD arose) (PP (IN from) (S (VP (VBG preexisting) (NP (JJ basal) (NN cell) (NNS adenomas)))))) (. .)))
Three tumors arose from preexisting basal cell adenomas.
(ROOT (S (NP (NNS Cells)) (VP (VBP come) (PP (IN from) (NP (VBG preexisting) (NNS cells)))) (. .)))