title: Comparison of three- and two-dimensional sonography in diagnosis of gallbladder diseases: preliminary experience.
abstract: OBJECTIVE
  To compare three-dimensional sonography with two-dimensional sonography for diagnosis of gallbladder diseases.
  
  
  METHODS
  Sixty-three patients with gallbladder diseases were examined with two- and three-dimensional sonography. The morphologic features presented on both modalities were analyzed, and the diagnostic accuracies of both modalities were evaluated and compared.
  
  
  RESULTS
  Both two- and three-dimensional sonography facilitated correct diagnosis in all patients with gallstones. Three-dimensional sonography had no influence on the diagnosis of gallstones compared with two-dimensional sonography. Three-dimensional sonography showed the granular surfaces in 18 (81.8%) of 22 cases of polypoid lesions and the pedunculated fundus in 19 (86.4%) of 22, whereas two-dimensional sonography displayed them in 10 (45.5%) and 3 (13.6%) of 22, respectively (P < .05 and .001). Three- and two-dimensional sonography made correct differential diagnoses between non-neoplastic and neoplastic polyps in 20 (90.9%) and 12 (54.5%) of 22, respectively (P < .05). In gallbladder carcinoma, both three- and two-dimensional sonography accurately showed all the associated gallstones and intrahepatic bile duct dilatation. Two-dimensional sonography could not correctly define the locations of the lesions in 2 (28.6%) and tumor extension in 1 (14.3%) of 7 cases with pathologically proved gallbladder cancer, whereas three-dimensional sonography improved the diagnosis in these cases.
  
  
  CONCLUSIONS
  Three-dimensional sonography adds no advantages for diagnosis of gallstones compared with two-dimensional sonography, but it is better than two-dimensional sonography for differential diagnosis of gallbladder polyps and may improve the localization and staging for gallbladder carcinoma; however, additional studies are needed for further determination.
authors.affiliation: Department of Medical Ultrasonics, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, People's Republic of China.
authors.forename: Hui-Xiong
authors.initials: HX
authors.lastname: Xu
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Yin
authors.forename: Ming-De
authors.initials: MD
authors.lastname: Lu
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Dian-Chao
authors.initials: DC
authors.lastname: Yue
authors.forename: Guang-Jian
authors.initials: GJ
authors.lastname: Liu
mesh_terms: D002769:Cholelithiasis / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D005705:Gallbladder Diseases / Q000000981:diagnostic imaging*; D005706:Gallbladder Neoplasms / Q000000981:diagnostic imaging; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D011127:Polyps / Q000000981:diagnostic imaging; D014463:Ultrasonography