▁sympt oms ▁caused ▁by ▁a ▁blood ▁cl ot ▁ren al ▁ve in . ▁Other ▁less ▁common ▁causes ▁include ▁hyper co ag ul able ▁state , ▁invasion ▁by ▁ren al ▁cell ▁car cin oma , ▁kid ney ▁trans plant ation , ▁Be h c et ▁synd rome , ▁anti ph osph ol ip id ▁ant ib ody ▁synd rome ▁or ▁bl unt ▁tra uma ▁to ▁the ▁back ▁or ▁ab d omen . ▁ ▁Ve in ▁t issue ▁damage ▁Dam age ▁to ▁the ▁end oth el ial ▁t issue ▁of ▁the ▁ve in ▁can ▁be ▁caused ▁by ▁bl unt ▁damage , ▁tra uma ▁during ▁ven ography , ▁a ▁ren al ▁trans plant , ▁tum ors , ▁ac ute ▁re jection , ▁vas cul itis ▁or ▁sp ont aneous ▁micro - tra uma ▁to ▁the ▁end oth el ium ▁due ▁to ▁hom oc yst in uria . ▁C yst ath ion ine ▁beta ▁synth ase ▁def ic iency , ▁also ▁known ▁as ▁hom oc yst in uria , ▁is ▁an ▁aut os om al ▁re cess ive ▁inherited ▁dis order ▁in ▁which ▁the ▁body ▁is ▁not ▁able ▁to ▁process ▁certain ▁building ▁blocks ▁of ▁prote ins ▁correctly ▁due ▁to ▁a ▁mut ation ▁to ▁the ▁CBS ▁gene . ▁This ▁mut ation ▁causes ▁the ▁am ino ▁acid ▁hom oc yst ine ▁not ▁to ▁be ▁used ▁properly ▁thus ▁high ▁levels ▁build ▁up ▁in ▁the ▁blood , ▁dam aging ▁the ▁end oth el ial ▁t issue ▁and ▁increasing ▁the ▁lik elihood ▁of ▁R V T . ▁ ▁Dec re ased ▁blood