title: Endoscopic ultrasound-guided Trucut biopsy of gastrointestinal mesenchymal tumor.
abstract: BACKGROUND
  Data on the utility of endoscopic ultrasound-guided Trucut biopsy (EUS-TCB) for suspected gastrointestinal mesenchymal tumor (GIMT) are limited. This study aimed to determine the diagnostic yield and complications from EUS-TCB for GIMT.
  
  
  METHODS
  Consecutive patients with suspected upper gastrointestinal or rectal GIMT from the muscularis propria with a maximal diameter of 20 mm or more were enrolled in a prospective, single-center cohort. An EUS-TCB was performed when on-site fine-needle aspiration (FNA) cytology review of the lesion was deemed suboptimal. Gastrointestinal stromal tumor (GIST) and leiomyoma were defined by the presence or absence of positive immunochemistry (IC) for c-kit, respectively. All GIMTs with a nondiagnostic IC were considered as unspecified. The outcomes assessed included diagnostic pathologic and IC yield (when tested) and procedural complications.
  
  
  RESULTS
  In this study, 38 patients (24 women; median age, 62 years) with suspected GIMT (median maximal diameter, 42 mm; range, 20-120 mm) in the esophagus (n=6), stomach (n=28), duodenum (n=3), or rectum (n=1) underwent EUS-TCB without complications. Final diagnoses included GIST for 20 patients, leiomyoma for 13 patients, unspecified GIMT for 3 patients, and unknown disorder for 2 patients. An EUS-FNA was performed for 33 (87%) of the 38 patients, a diagnostic final cytology for 25 (76%) of 33 patients, and an FNA-IC for 12 (50%) of 24 patients. The EUS-TCB (median, 3 passes; range, 1-8 passes) obtained a visible tissue specimen in 37 (97%) of the 38 patients, with a median overall maximal fragment length of 3.5 mm (range, 0-15 mm). The diagnostic final TCB histology and TCB-IC were obtained, respectively, in 79 and 97% of the samples tested.
  
  
  CONCLUSIONS
  In this cohort, EUS-TCB provided diagnostic histology and IC for 79 and 97% of the patients, respectively. For the initial biopsy of GIMT, EUS-TCB may be considered an acceptable alternative to EUS-FNA.
authors.affiliation: Department of Gastroenterology and Hepatology, Indiana University Medical Center, 550 North University Boulevard, UH 4100, Indianapolis, IN 46202, USA. jodewitt@iupui.edu
authors.forename: John
authors.initials: J
authors.lastname: DeWitt
authors.forename: Robert E
authors.initials: RE
authors.lastname: Emerson
authors.forename: Stuart
authors.initials: S
authors.lastname: Sherman
authors.forename: Mohammad
authors.initials: M
authors.lastname: Al-Haddad
authors.forename: Lee
authors.initials: L
authors.lastname: McHenry
authors.forename: Gregory A
authors.initials: GA
authors.lastname: Cote
authors.forename: Julia K
authors.initials: JK
authors.lastname: Leblanc
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016009:Chi-Square Distribution; D019160:Endosonography; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000473:pathology*; D046152:Gastrointestinal Stromal Tumors / Q000473:pathology*; D006801:Humans; D007889:Leiomyoma / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D018084:Ultrasonography, Interventional