( ( The condition ) ( ( occurs ( because ( ( ( blood pools ) ( in ( ( ( the ( varicose ( testicular veins ) ) ) ( -LRB- ( ( pampiniform plexus ) -RRB- ) ) ) ( since ( ( the valves ) ( in ( the veins ) ) ) ) ) ) ) ( ( ( are leaky ) and ) ( ( do not ) ( close properly ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN condition)) (VP (VBZ occurs) (SBAR (IN because) (S (NP (NP (NN blood) (NNS pools)) (PP (IN in) (NP (NP (NP (DT the) (JJ varicose) (NN testicular) (NNS veins)) (PRN (-LRB- -LRB-) (NP (NN pampiniform) (NNS plexus)) (-RRB- -RRB-))) (PP (IN since) (NP (NP (DT the) (NNS valves)) (PP (IN in) (NP (DT the) (NNS veins)))))))) (VP (VP (VBP are) (ADJP (JJ leaky))) (CC and) (VP (VBP do) (RB not) (VP (VB close) (ADVP (RB properly)))))))) (. .)))
The condition occurs because blood pools in the varicose testicular veins (pampiniform plexus) since the valves in the veins are leaky and do not close properly.
(ROOT (S (NP (JJ Varicose) (NNS veins)) (VP (VBP are) (NP (NP (NNS veins)) (SBAR (WHNP (WDT that)) (S (VP (VBP become) (S (VP (VBG enlarged) (SBAR (IN because) (S (NP (DT the) (NNS valves)) (ADVP (RB no) (RB longer)) (VP (VB close) (ADVP (RB properly)))))))))))) (. .)))