Portal vein stenosis with cholangiocarcinoma invasion treated by self expanding stent: two cases, ABE Ryosuke;SAI Syouei;NISHIMURA Megumi;KURODA Hanako;TOYOFUKU Kosuke;YAMADA Ayumi;TASHIRO Yuki;MIZOBUCHI Naruki;TAKAHAMA Noritsugu;SOMEYA Yumiko;HOSAKA Norifumi;MUNECHIKA Jiro;SEINO Noritaka;GOKAN Takehiko, 第47回日本IVR学会総会, 31 May 2018, 東京