title: Prospective study of a Trucut needle for performing EUS-guided biopsy with EUS-guided FNA rescue.
abstract: BACKGROUND
  EUS-guided FNA (EUS-FNA) is an accurate technique for sampling extraintestinal masses and lymph nodes. The use of a Trucut needle to perform EUS-guided biopsy (EUS-TCB) may improve the results or simplify the procedure. To date, few studies have prospectively assessed the performance and the safety of EUS-TCB.
  
  
  METHODS
  Patients with a known or a suspected malignancy referred for a diagnostic and/or staging EUS examination were enrolled in a prospective study. EUS-guided biopsy was performed first with a 19-gauge Trucut needle. If the Trucut failed to obtain an adequate sample or when the "in room" touch preparation was benign, EUS-FNA was performed with a standard 22-gauge FNA needle. The objective of the study was to assess the yield of detection of malignancy and the safety of EUS-TCB in patients with known or suspected malignancies and to investigate if EUS-FNA has a role for rescue in cases of Trucut failure.
  
  
  METHODS
  Thirty-nine lesions underwent EUS-TCB in 30 patients. Sufficient follow-up was available for all patients. By using EUS-TCB, we were able to obtain a sample for diagnosis in all but 3 patients (one pancreatic mass and two lymph nodes) in which technical problems arose. In these patients, the diagnosis was obtained in two cases by EUS-FNA and in the other one by EUS-TCB from the primary pancreatic tumor. The yield of detection of malignancy for EUS-TCB was 84%. No complications were recorded in any patients at 1 and 7 days of follow-up. The sample size is limited to generalize conclusions.
  
  
  CONCLUSIONS
  EUS-TCB is a safe and an accurate procedure to obtain a histologic diagnosis in patients with known or suspected malignancies. EUS-FNA can serve as a rescue technique in cases of Trucut failure.
authors.affiliation: Developmental Endoscopy Unit, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota 55905, USA.
authors.forename: Angels
authors.initials: A
authors.lastname: Ginès
authors.forename: Maurits J
authors.initials: MJ
authors.lastname: Wiersema
authors.forename: Jonathan E
authors.initials: JE
authors.lastname: Clain
authors.forename: Nicole L
authors.initials: NL
authors.lastname: Pochron
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Rajan
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Levy
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044963:Biopsy, Fine-Needle / Q000295:instrumentation; D003937:Diagnosis, Differential; D019160:Endosonography; D004867:Equipment Design; D004869:Equipment Safety; D005260:Female; D005500:Follow-Up Studies; D005770:Gastrointestinal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015203:Reproducibility of Results