title: En bloc endoscopic submucosal dissection of a 14-cm laterally spreading adenoma of the rectum with involvement to the anal canal: expanding the frontiers of endoscopic surgery (with video).
abstract: BACKGROUND
  Endoscopic submucosal dissection (ESD) was recently developed in Japan for en bloc removal of laterally spreading tumors (LSTs). Although initially used for gastric tumors, ESD has now been applied to lesions elsewhere in the gut. Recent reports from Japan included removal of colorectal lesions up to 10 cm.
  
  
  OBJECTIVE
  To show the feasibility of ESD to remove en bloc, very large LSTs of the rectum, even when there is involvement to the dentate line.
  
  
  METHODS
  Case report.
  
  
  METHODS
  The procedure was performed at an American GI unit. The patient was admitted to the hospital after the procedure for observation.
  
  
  METHODS
  A 53-year-old patient, with a 14-cm tubulovillous adenoma of the rectum, which, at its maximal extent, involved two thirds of the circumference of the rectum. The tumor extended distally to the dentate line.
  
  
  METHODS
  En bloc submucosal dissection with a conventional needle-knife to remove the neoplasm.
  
  
  METHODS
  Completeness of en bloc removal of the tumor and subsequent follow-up endoscopy that showed no residual neoplasm.
  
  
  RESULTS
  The tumor was able to be removed en bloc by ESD. The distal margin included squamous mucosa. At a 2.5-week endoscopic follow-up, a 3-mm focus of residual polyp was seen and removed. At the time of the last follow-up, there was complete healing of the wound and no residual neoplasm.
  
  
  CONCLUSIONS
  Single case.
  
  
  CONCLUSIONS
  This case demonstrated the feasibility of using ESD to remove large laterally spreading rectal tumors, including when there was involvement to the dentate line (and the dissection line must include squamous mucosa of the anal canal). ESD is a promising alternative to conventional surgical techniques; however, additional published experience is needed.
authors.affiliation: Division of Gastroenterology, University of Missouri Hospital and Clinics, Columbia, Missouri 65212, USA.
authors.forename: Mainor R
authors.initials: MR
authors.lastname: Antillon
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Bartalos
authors.forename: Marc L
authors.initials: ML
authors.lastname: Miller
authors.forename: Alberto A
authors.initials: AA
authors.lastname: Diaz-Arias
authors.forename: Jamal A
authors.initials: JA
authors.lastname: Ibdah
authors.forename: John B
authors.initials: JB
authors.lastname: Marshall
mesh_terms: D000236:Adenoma / Q000473:pathology / Q000601:surgery*; D001003:Anal Canal / Q000473:pathology*; D004210:Dissection / Q000379:methods; D004564:Electrocoagulation / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000473:pathology / Q000601:surgery*; D013906:Thoracoscopy / Q000379:methods*