Reliability of the Acetylcholinesterase (ACE) Reaction in Rectal Mucosal Biopsies for the Diagnosis of Hirschsprung's Disease

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Abstract
The ACE reaction in superficial rectal biopsies is a valuable diagnostic procedure for Hirschsprung's disease. Although the literature mentions a reliability as high as 100 percent accuracy, a false negative ACE reaction can occur. So the result of the histochemical examination can never be seen apart from the clinical picture. This paper deals with false-negative ACE reactions in 3 children. A false-negative ACE reaction is suggested to be caused by a developmental disturbance in the 6th or 7th embryonal week. Since this disturbance can be responsible also for an aganglionosis of the total colon and a part of the ileum, the chance of a false negative ACE reaction is postulated to be increased in an extensive aganglionosis in precisely those cases which are already a diagnostic challenge for the clinician.

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