Did I miss a river bet?

[TGoldman]

Who bets the river and why? If we check, is it to induce a bluff or should hero consider folding to a large bet? Villain is very loose playing any four pre-flop and aggressive post-flop.

PL Omaha Hi/Low $2-$2
Hero ($200)
Villain ($350)

Hero is BB with A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/club.gif[/img]

PRE-FLOP
Villain calls $2, 5 folds, SB checks, Hero raises the pot, villain calls $6, SB folds.

(Pot $18) FLOP 9[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/spade.gif[/img]
Hero bets $18, villain calls $18.

(Pot $54) TURN 4[img]/images/graemlins/club.gif[/img]
Hero bets $54, villain calls $54.

(Pot $162) RIVER 4[img]/images/graemlins/heart.gif[/img]
Hero ...