( ( Since ( ( ( the closure ) ( of ( the duodenum ) ) ) ( is ( complete ( in ( duodenal atresia ) ) ) ) ) ) ( , ( ( no air ) ( ( is ( seen ( in ( the ( distal duodenum ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Since) (S (NP (NP (DT the) (NN closure)) (PP (IN of) (NP (DT the) (NN duodenum)))) (VP (VBZ is) (ADJP (JJ complete) (PP (IN in) (NP (JJ duodenal) (NN atresia))))))) (, ,) (NP (DT no) (NN air)) (VP (VBZ is) (VP (VBN seen) (PP (IN in) (NP (DT the) (JJ distal) (NN duodenum))))) (. .)))
Since the closure of the duodenum is complete in duodenal atresia, no air is seen in the distal duodenum.
(ROOT (S (NP (JJS Most) (NNS digestion)) (VP (VBZ is) (VP (VBN completed) (PP (IN in) (NP (DT the) (NN duodenum))))) (. .)))