title: Accuracy of computed tomographic colonography for the detection of polyps and colorectal tumors: a systematic review and meta-analysis.
abstract: BACKGROUND
  The real accuracy of computed tomographic colonography (CTC) is still unknown.
  
  
  OBJECTIVE
  To perform a meta-analysis of the diagnostic accuracy of CTC for the detection of polyps and colorectal tumors.
  
  
  METHODS
  
  
  
  METHODS
  Studiesassessing the accuracy of CTC for the detection of colorectal polyps and tumors were selected. data synthesis: Meta-analyses combining sensitivities, specificities and likelihood ratios (LRs) for the diagnosis of polyps and colorectal tumors were carried out.
  
  
  RESULTS
  Forty-seven studies, providing data of 10,546 patients, were included. Overall per-polyp sensitivity of CTC was 66% (64-68%), for polyps 6-9 mm in size it was 59% (56-61%), and 76% (73-79%) for polyps larger than 9 mm. Overall per-patient sensitivity was 69% (66-72%), for polyps 6-9 mm 60% (56-65%), and 83% (70-85%) for lesions larger than 9 mm. Overall CTC specificity was 83% (81-84%). Positive and negative LRs were 2.9 (1.8-4) and 0.38 (0.27-0.53), respectively; for polyps 6-9 mm in size, they were 3.8 (2.5-5.7) and 0.4 (0.27-0.59), and 12.3 (7.7-19.4) and 0.19 (0.12-0.3) for polyps larger than 9 mm.
  
  
  CONCLUSIONS
  CTC is highly specific for the detection of colorectal polyps and tumors. Some studies reported high sensitivities, but the results of the studies were highly heterogeneous, while the studied variables explained only part of this discrepancy.
authors.affiliation: Department of Gastroenterology and Hepatology, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Madrid, Spain. mariachs2005@gmail.com
authors.forename: María
authors.initials: M
authors.lastname: Chaparro
authors.forename: Javier P
authors.initials: JP
authors.lastname: Gisbert
authors.forename: Lourdes
authors.initials: L
authors.lastname: Del Campo
authors.forename: José
authors.initials: J
authors.lastname: Cantero
authors.forename: José
authors.initials: J
authors.lastname: Maté
mesh_terms: D003110:Colonic Neoplasms / Q000175:diagnosis*; D003111:Colonic Polyps / Q000175:diagnosis*; D003113:Colonoscopy; D006801:Humans; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed