title: Category migration of renal cystic masses with use of gadolinium-enhanced magnetic resonance imaging.
abstract: The Bosniak renal cyst classification has been accepted by urologists and radiologists as a way of diagnosing cystic renal masses and determining the management approach. We report two cases of a renal cystic mass that showed a category change from category II on the basis of enhanced computed tomography to category IV after further gadolinium-enhanced magnetic resonance imaging. In both cases, the cysts were later confirmed as kidney cancer by pathology.
authors.affiliation: Department of Urology, Soonchunhyang University College of Medicine, Seoul, Korea.
authors.forename: Woong Bin
authors.initials: WB
authors.lastname: Kim
authors.forename: Seung Woo
authors.initials: SW
authors.lastname: Lee
authors.forename: Seung Whan
authors.initials: SW
authors.lastname: Doo
authors.forename: Won Jae
authors.initials: WJ
authors.lastname: Yang
authors.forename: Yun Seob
authors.initials: YS
authors.lastname: Song
authors.forename: Jin Seok
authors.initials: JS
authors.lastname: Jeon
authors.forename: In Ho
authors.initials: IH
authors.lastname: Choi
authors.forename: So Young
authors.initials: SY
authors.lastname: Jin