title: Endoscopic ultrasound in the evaluation of chronic upper abdominal pain of unknown etiology: a retrospective chart review examining the efficacy of EUS in determining a new diagnosis.
abstract: OBJECTIVE
  To explore the utility of endoscopic ultrasound (EUS) in the evaluation of chronic upper abdominal pain (UAP) of undetermined etiology.
  
  
  BACKGROUND
  Chronic UAP is a common problem with a challenging diagnosis and management. The role of EUS in the diagnosis of UAP may minimize additional testing; however, few studies describe the percentage of new diagnoses yielded in these patients.
  
  
  METHODS
  We conducted a retrospective analysis by reviewing electronic medical records at Scott and White Memorial Hospital, Texas A&M Health Sciences Center for patients with abdominal pain for ≥ 12 months not explained by previous workup referred for EUS for chronic UAP from January 1, 1998 through October 1, 2007. Patients with previous EUS in past 12 months were excluded from the study. Patient demographic data and imaging performed 6 months before and 24 months after EUS were reviewed and results documented.
  
  
  RESULTS
  EUS was successful at diagnosing a new clinical etiology of chronic UAP in 33 patients (8.89%) with previous workup that was unrevealing for a definitive diagnosis. The most frequent diagnoses included pancreaticobiliary tree abnormalities, chronic pancreatitis, and fatty liver disease.
  
  
  CONCLUSIONS
  Our results support the fact that the majority of patients UAP with prior imaging will have no identifiable organic etiology found on EUS to explain their pain; however, we suggest that EUS be considered in patients with suspected pancreatic or biliary pathology.
authors.affiliation: *Department of Internal Medicine †Department of Gastroenterology ‡Texas A&M Health Science Center College of Medicine §Department of Biostatics, Baylor Scott & White Health, Texas A&M Health Science Center College of Medicine, Temple, TX.
authors.forename: Michelle B
authors.initials: MB
authors.lastname: Thompson
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Ramirez
authors.forename: Lisa M
authors.initials: LM
authors.lastname: De La Rosa
authors.forename: Adam S
authors.initials: AS
authors.lastname: Wood
authors.forename: Shiv
authors.initials: S
authors.lastname: Desai
authors.forename: Ananth
authors.initials: A
authors.lastname: Arjunan
authors.forename: Juhee
authors.initials: J
authors.lastname: Song
authors.forename: Richard A
authors.initials: RA
authors.lastname: Erickson
mesh_terms: D015746:Abdominal Pain / Q000000981:diagnostic imaging* / Q000209:etiology; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D059350:Chronic Pain / Q000000981:diagnostic imaging* / Q000209:etiology; D019160:Endosonography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D012307:Risk Factors; D013781:Texas; D013997:Time Factors; D055815:Young Adult