Table 1. Studies on Unilateral or Bilateral Stenting in Hilar Cholangiocarcinoma.

R, retrospective; P, prospective; RCT, randomized controlled trial; NA, not available.

^a)The Bismuth type II and III patients were divided into three groups (unilateral-A, one lobe opacified with same lobe drained; unilateral-B, both lobes opacified with one lobe drained and Bilateral, both lobes opacified with both lobes drained); ^b)The two stents were inserted through dual transhepatic tracts in a "Y" configuration or a single transhepatic tract in a "T" configuration; ^c)The cumulative stent patency time for bilateral plastic and self-expanding metal stenting was significantly longer than that for unilateral stenting (p<0.0001); ^d)Stent patency was presented as plastic/self-expanding metal stent sequentially.