Mongolian spots on back.
 Patient has NF-1
(ROOT (FRAG (NP (NP (JJ Mongolian) (NNS spots)) (PP (IN on) (NP (RB back)))) (. .)))
(ROOT (S (NP (NN Patient)) (VP (VBZ has) (NP (NN NF-1)))))
( ( ( Mongolian spots ) ( on back ) ) . )
( Patient ( has NF-1 ) )