title: Colorectal carcinomas: diagnosis and preoperative staging by hydrocolonic sonography.
abstract: BACKGROUND
  The aim of this study was to determine the sensitivity, specificity, and predictive value of hydrocolonic sonography (HS) in the detection and preoperative staging of colonic carcinomas.
  
  
  METHODS
  One hundred four patients referred to our department for colorectal disease were examined in a prospective study with conventional transabdominal sonography followed by HS and other well-established means for detection of colorectal cancer. In all diagnosed colorectal carcinomas, surgical resection and histologic examination were carried out, and the histologically confirmed tumor stage was then compared with the stage predicted by HS.
  
  
  RESULTS
  HS staged and made a correct diagnosis of carcinoma in 39 of 40 patients, with a sensitivity of 97.5% and a specificity of 98%. Positive predictability was 97.5% and negative predictability 98%. In the evaluation of cancer depth invasion, HS staging was correct in all but one case, in which a T3 tumor was incorrectly judged to be T2. In the assessment of the presence or absence of peritumor metastatic lymph nodes, HS had a sensitivity of 50% and a specificity of 100%.
  
  
  CONCLUSIONS
  HS allows the diagnosis and preoperative staging of colorectal carcinomas with high sensitivity, specificity, and predictive value. We highly recommend its preoperative use because of its definitive influence on surgical approach.
authors.affiliation: Departamento de Radiodiagnóstico, Hospital del Pino, Las Palmas de Gran Canaria, Canary Islands, Spain.
authors.forename: C R
authors.initials: CR
authors.lastname: Hernández-Socorro
authors.forename: C
authors.initials: C
authors.lastname: Guerra
authors.forename: J
authors.initials: J
authors.lastname: Hernández-Romero
authors.forename: A
authors.initials: A
authors.lastname: Rey
authors.forename: P
authors.initials: P
authors.lastname: López-Facal
authors.forename: V
authors.initials: V
authors.lastname: Alvarez-Santullano
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000000981:diagnostic imaging* / Q000473:pathology / Q000556:secondary / Q000601:surgery; D003106:Colon / Q000000981:diagnostic imaging; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D003949:Diagnostic Techniques, Surgical; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa / Q000000981:diagnostic imaging; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D012007:Rectum / Q000000981:diagnostic imaging; D012680:Sensitivity and Specificity; D014463:Ultrasonography