title: Usefulness of endoscopic ultrasonography in patients with "idiopathic" acute pancreatitis.
abstract: OBJECTIVE
  No underlying cause is found in as many as 30% of patients with acute pancreatitis. The aim of this study was to evaluate the usefulness of endoscopic ultrasonography in the diagnosis of biliary tract pathology or chronic pancreatitis in these patients.
  
  
  METHODS
  We evaluated 168 patients who were referred with idiopathic pancreatitis. Diagnoses obtained by endoscopic ultrasonography were prospectively compared with those obtained at surgery in 101 patients, by endoscopic cholangiopancreatography in 49 patients, or by bile crystal analysis and medical follow-up in 18 patients.
  
  
  RESULTS
  Endoscopic ultrasonography was abnormal in 135 (80%) patients, 124 of whom had biliary tract disease. When the results of endoscopic ultrasonography were compared with those made after multidisciplinary investigations, endoscopic ultrasonography correctly identified the cause-most commonly biliary tract disease-of the "idiopathic" pancreatitis in 155 (92%) of the 168 patients.
  
  
  CONCLUSIONS
  Endoscopic ultrasonography is valuable in determining the cause of acute pancreatitis in patients initially considered to have idiopathic pancreatitis.
authors.affiliation: Division of Gastroenterology, University Hospital, Geneva, Switzerland.
authors.forename: J L
authors.initials: JL
authors.lastname: Frossard
authors.forename: L
authors.initials: L
authors.lastname: Sosa-Valencia
authors.forename: G
authors.initials: G
authors.lastname: Amouyal
authors.forename: O
authors.initials: O
authors.lastname: Marty
authors.forename: A
authors.initials: A
authors.lastname: Hadengue
authors.forename: P
authors.initials: P
authors.lastname: Amouyal
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001646:Bile / Q000737:chemistry; D002648:Child; D002760:Cholangiopancreatography, Endoscopic Retrograde; D002763:Cholecystectomy; D003937:Diagnosis, Differential; D016145:Endoscopy, Digestive System; D005260:Female; D005704:Gallbladder / Q000473:pathology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D010195:Pancreatitis / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000209:etiology* / Q000378:metabolism; D011237:Predictive Value of Tests; D014463:Ultrasonography / Q000379:methods