title: Renal cysts as strongest association with abdominal aortic aneurysm in elderly.
abstract: OBJECTIVE
  The aim of this study is to investigate the positive association between the presence of renal cysts and AAA.
  
  
  METHODS
  A retrospective chart review on the clinical data of 396 consecutive patients, who underwent CT scans for preoperative evaluation of thoracic and cardiovascular surgery in Sapporo Medical University from the period of January 2007 to December 2008, was conducted.
  
  
  RESULTS
  When comparing patients with renal cysts (n = 164) to those without (n = 233), there was a statistically significant difference between the presence of renal cysts and male gender (p = 0.007), hypertension (p = 0.003), and AAA (p < 0.001) on univariate analysis. In addition, when comparing patients with AAA to those without, although COPD but not AAA was associated with renal cysts in less than 65 years old, the presence of renal cysts was the strongest association with AAA among patients belonging to the 65 to 74 years old group and over 75 years old group on multivariate analysis.
  
  
  CONCLUSIONS
  There is a statistically higher incidence of renal cysts in patients with AAA compared to patients without AAA in the group of elder cardiovascular patients. It is likely that AAA and renal cysts share a common pathogenesis.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Sapporo Medical University, School of Medicine, Hokkaido, Japan.
authors.forename: Toshiro
authors.initials: T
authors.lastname: Ito
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Kawaharada
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Kurimoto
authors.forename: Atsushi
authors.initials: A
authors.lastname: Watanabe
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Tachibana
authors.forename: Ryo
authors.initials: R
authors.lastname: Harada
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Maeda
authors.forename: Hitoki
authors.initials: H
authors.lastname: Hashiguchi
authors.forename: Makoto
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Higami
keywords: COPD; abdominal aortic aneurysm; renal cysts
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