title: Internal sphincter myectomy for adult Hirschsprung's disease: a single institute experience.
abstract: OBJECTIVE
  Adult Hirschsprungs disease is a rare disease and frequently misdiagnosed as the long-standing refractory constipation. Almost all cases have short or ultra-short aganglionic segment of distal rectum. The clinical features are different from those in childhood when the diseased segment is long. Amongst the few successful operations that have been used to treat this condition, internal sphincter myectomy has been proposed as a simple and low morbidity procedure, but only a few literatures reported the results. The present study aimed to evaluate the outcomes of anorectal myectomy in adult Hirschsprung's disease.
  
  
  METHODS
  All medical records of adult Hirschsprung's disease between January 1, 1997 and April 30, 2008 were retrospectively reviewed The histological criteria for diagnosis were increase in the number of cholinergic nerve fibers in the lamina propria, muscularis mucosae, and submucosa, and the absence of ganglia in the submucosa. All cases underwent internal sphincter myectomy as the first operation. Post-operative complications, number of defecation per week, and the need for a second operation were studied.
  
  
  RESULTS
  Seven patients met the criteria. All patients had the long history of constipation. Anorectal myectomy was performed as the first operation in all cases. Four patients (57%) had good results, without complication and no further operation was needed up to the last follow-up (26-86 months). Two cases underwent subtotal and total colectomy after myectomy to achieve good results eventually. Only one patient had a poor result after Left colectomy and Total proctocolectomy with ileal pouch anal anastomosis.
  
  
  CONCLUSIONS
  Internal sphincter myectomy, the simple and complication-free procedure, provides the satisfactory outcomes for adult Hirschsprung's disease. This technique should be the first operation for this condition.
authors: Division of Colon and Rectal, Department of Surgery, Chulalongkorn University, King Chulalongkorn Memorial Hospital, Bangkok, Thailand. jpattanaarun@gmail.com
authors: Jirawat
authors: J
authors: Pattana-arun
authors: Tawornrath
authors: T
authors: Ruanroadroun
authors: Kasaya
authors: K
authors: Tantiphalachiva
authors: Chucheep
authors: C
authors: Sahakitrungruang
authors: Puttarat
authors: P
authors: Attithansakul
authors: Arun
authors: A
authors: Rojanasakul
mesh_terms: D000328:Adult; D000368:Aged; D001003:Anal Canal / Q000601:surgery*; D003672:Defecation; D005260:Female; D005500:Follow-Up Studies; D006627:Hirschsprung Disease / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008297:Male; D011183:Postoperative Complications; D012007:Rectum / Q000601:surgery*; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult