title: Influence of layer, size and organ of subepithelial lesions of upper gastrointestinal tract in outcomes of endoscopic ultrasound-guided fine-needle aspiration.
abstract: BACKGROUND
  The endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) has emerged as a minimally invasive and safe method for material procurement in the differential diagnosis of subepithelial lesions (SEL) of upper gastrointestinal tract (UGT), especially in suspicious lesions of gastrointestinal stromal tumors (GIST). There are few studies discussing the factors that influence the EUS-FNA in the diagnosis of SEL.
  
  
  OBJECTIVE
  To establish possible associations between lesion size, layer and organ of origin with the outcome of EUS-FNA in patients with SELs of UGT.
  
  
  METHODS
  A retrospective analysis using data of patients referred to French-Brazilian Center of EUS of endoscopy Department of Santa Casa de São Paulo Hospital, with previous endoscopic diagnosis of SEL, which underwent EUS-FNA from May 2006 to August 2011.
  
  
  RESULTS
  A total of 222 patients were submitted to EUS. 15 with extrinsic compressions and 207 with SEL. Of these, 89 underwent to EUS-FNA. Ninety-two SEL were diagnosed on EUS and punctured. The EUS-FNA was positive in 58.7%. In lesions measuring 2-3 cm and >3 cm, the EUS-FNA was positive in 80% and 72%, respectively (P < 0.001).
  
  
  CONCLUSIONS
  The size of SELs was the only variable that influenced the outcome of EUS-FNA. Best results are achieved in lesions larger than 2 cm.
authors.affiliation: Santa Casa de São Paulo, São Paulo, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Assef
authors.affiliation: Santa Casa de São Paulo, São Paulo, Brazil.
authors.forename: L
authors.initials: L
authors.lastname: Rossini
authors.affiliation: Santa Casa de São Paulo, São Paulo, Brazil.
authors.forename: G Silva
authors.initials: GS
authors.lastname: Neto
authors.affiliation: Santa Casa de São Paulo, São Paulo, Brazil.
authors.forename: F
authors.initials: F
authors.lastname: Nakao
authors.affiliation: Santa Casa de São Paulo, São Paulo, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Sayeg
authors.affiliation: Santa Casa de São Paulo, São Paulo, Brazil.
authors.forename: O
authors.initials: O
authors.lastname: Araki