title: Multiphase CT enterography evaluation of small-bowel vascular lesions.
abstract: OBJECTIVE
  By use of multiphase CT enterography (CTE), small-bowel vascular lesions associated with gastrointestinal bleeding can be classified into three categories--angioectasias, arterial lesions, and venous abnormalities--on the basis of common morphology and enhancement patterns. This article will review the unique patterns of enhancement and lesion morphology seen on multiphase CTE and how those findings enable detection and characterization of specific lesions in many cases.
  
  
  CONCLUSIONS
  Because of the high prevalence in nonbleeding patients and frequent multiplicity of angioectasias, determining the clinical benefit from their detection by multiphase CTE and endoscopy is problematic. Although arterial lesions are less commonly encountered clinically, their detection is critically important because of a high risk of life-threatening bleeding. Along with wireless capsule endoscopy and balloon-assisted endoscopy, multiphase CTE is a useful tool for the evaluation of patients with obscure gastrointestinal bleeding due to small-bowel vascular lesions.
authors.affiliation: Department of Radiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA. huprich@mayo.edu
authors.forename: James E
authors.initials: JE
authors.lastname: Huprich
authors.forename: John M
authors.initials: JM
authors.lastname: Barlow
authors.forename: Stephanie L
authors.initials: SL
authors.lastname: Hansel
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Alexander
authors.forename: Jeff L
authors.initials: JL
authors.lastname: Fidler
mesh_terms: D016888:Angiodysplasia / Q000000981:diagnostic imaging; D001165:Arteriovenous Malformations / Q000000981:diagnostic imaging; D053704:Capsule Endoscopy; D058582:Double-Balloon Enteroscopy; D016099:Endoscopy, Gastrointestinal; D006471:Gastrointestinal Hemorrhage / Q000145:classification* / Q000000981:diagnostic imaging*; D006801:Humans; D007421:Intestine, Small / Q000098:blood supply* / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014652:Vascular Diseases / Q000000981:diagnostic imaging*