title: [Arch and sentinel: surgical technique of sentinel node biopsy with the axillopectoral muscle].
abstract: OBJECTIVE
  Identify the axillopectoral muscle (usually called Langer's axillary arch) and know the main surgical techniques of axillary sentinel node biopsies.
  
  
  METHODS
  We present the results of our five-year clinical prospective study: the presence of this anomaly is diagnosed peroperatively during a sentinel node biopsy.
  
  
  RESULTS
  Langer's arch is identified in 1,7%, often with an unilateral distribution. Lymph nodes are just near or behind the muscle. Sentinel node biopsy dissection is difficult in about 40%.
  
  
  CONCLUSIONS
  The embryological derivation and anatomical features of this muscle are described, with emphasis on the surgical applications. Its presence or absence should be ascertained in every sentinel node biopsy because of the risks of axillary dissection complications by this ectopic muscle.
authors.affiliation: Service de chirurgie oncologique, centre Jean-Perrin, 38, rue Montalembert, 63000 Clermont-Ferrand, France. chenegautier@yahoo.fr
authors.forename: G
authors.initials: G
authors.lastname: Chêne
authors.forename: G
authors.initials: G
authors.lastname: Le Bouëdec
authors.forename: J
authors.initials: J
authors.lastname: Dauplat
mesh_terms: D000328:Adult; D000368:Aged; D001365:Axilla / Q000002:abnormalities* / Q000601:surgery; D001943:Breast Neoplasms / Q000175:diagnosis / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010369:Pectoralis Muscles / Q000002:abnormalities* / Q000601:surgery; D011446:Prospective Studies; D021701:Sentinel Lymph Node Biopsy / Q000379:methods*