( ( Diseases ( of ( ( thyroid and ) parathyroid ) ) ) ( glands . ) )
(ROOT (S (NP (NP (NNS Diseases)) (PP (IN of) (NP (NN thyroid) (CC and) (NN parathyroid)))) (VP (VBZ glands)) (. .)))
Diseases of thyroid and parathyroid glands.
(ROOT (S (NP (DT The) (CD two) (JJ parathyroid) (NNS glands)) (VP (VBP are) (VP (VBN located) (PP (IN behind) (NP (DT the) (NN thyroid) (NN gland))))) (. .)))