title: [Endoscopic ultrasound guided fine needle aspiration biopsy: first experience in Mexico].
abstract: BACKGROUND
  Endoscopic ultrasound (EUS) -guided fine-needle aspiration (FNA) is a recently described diagnostic method that has demonstrated its usefulness in certain clinical conditions.
  
  
  METHODS
  Descriptive and retrospective analysis of the initial experience with EUS-guided FNA at the Hospital General "Dr Manuel Gea González", during the period between March, 1998 and December, 1999. A Pentax FG 32UA linear echoendoscope was used for all cases, as well as two different types of needles. Procedures were performed under sedation and a cytopathologist was not present during the FNA. The biopsy site, quality of the material obtained, cytological as well as final diagnosis and complications are described.
  
  
  RESULTS
  A total of 40 procedures were done. FNA was performed on the pancreas, esophagus, stomach, duodenum, mediastinum, rectum and lymph nodes. A diagnosis was obtained in 75%. In the remaining cases, the material obtained was either inadequate or insufficient for diagnosis. FNA results were confirmed histologically in all cases that underwent surgery. Complication presented in 2.5%, and consisted of one case of self-limited and clinically irrelevant bleeding. The best results were obtained in lymph nodes, mediastinum, liver and pancreatic tumors.
  
  
  CONCLUSIONS
  This study demonstrated the utility of EUS-guided FNA to obtain cytologic material for diagnosis in a high percentage of cases and with minimal complications. Some factors that could lead to better results were also identified.
authors.affiliation: Departamento de Gastroenterología, Hospital General Dr Manuel Gea González, Instituto Nacional de Ciencias Médicas y Nutrición, Salvador Zubirán. guillermodelamora@yahoo.com
authors.forename: José
authors.initials: J
authors.lastname: Guillermo de la Mora-Levy
authors.forename: Alma Penélope
authors.initials: AP
authors.lastname: Romero-Lagarza
authors.forename: Nassira M
authors.initials: NM
authors.lastname: de Larios
authors.forename: María Elena
authors.initials: ME
authors.lastname: López-Acosta
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Rodríguez-Vanegas
authors.forename: Alberto
authors.initials: A
authors.lastname: Farca-Belsaguy
mesh_terms: D001707:Biopsy, Needle / Q000379:methods*; D019160:Endosonography; D005770:Gastrointestinal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D008800:Mexico; D012189:Retrospective Studies