title: Endoscopic ultrasonography of superficial esophageal cancers using a thin ultrasound probe system equipped with switchable radial and linear scanning modes.
abstract: BACKGROUND
  Detailed information on the depth of invasion of superficial esophageal cancer is required for endoscopic mucosal resection. As a pretherapeutic diagnostic procedure, endoscopic ultrasonography using conventional 7.5 MHz systems has been ineffective at providing sufficient details. A newly developed, thin ultrasound probe system provides both radial and linear scanning for evaluation of superficial esophageal cancer.
  
  
  METHODS
  Endoscopic ultrasonography was performed in 16 patients using a switchable probe driven at 20 MHz. Seventeen lesions of superficial esophageal cancer were evaluated for depth of invasion to discriminate mucosal from submucosal penetration.
  
  
  RESULTS
  The overall accuracy of staging was 64.7%. In all six errors, mucosal cancers were overstaged as submucosal invasion. The diagnostic accuracy was 80% when the muscularis mucosae was visualized.
  
  
  CONCLUSIONS
  A 20 MHz linear-radial switchable probe is a useful new method in the staging of superficial esophageal cancer.
authors.affiliation: First Department of Internal Medicine, Yamaguchi University School of Medicine, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yanai
authors.forename: T
authors.initials: T
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Harada
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: M
authors.initials: M
authors.lastname: Nishiaki
authors.forename: T
authors.initials: T
authors.lastname: Shigemitsu
authors.forename: M
authors.initials: M
authors.lastname: Tada
authors.forename: K
authors.initials: K
authors.lastname: Okita
authors.forename: T
authors.initials: T
authors.lastname: Kawano
authors.forename: S
authors.initials: S
authors.lastname: Nagasaki
mesh_terms: D000368:Aged; D019160:Endosonography / Q000295:instrumentation* / Q000592:standards; D004938:Esophageal Neoplasms / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009092:Mucous Membrane / Q000000981:diagnostic imaging / Q000473:pathology; D009361:Neoplasm Invasiveness / Q000000981:diagnostic imaging; D009367:Neoplasm Staging / Q000379:methods