Colonoscopy as a useful tool in determining the transition zone in transanal endorectal pull-through in Hirschsprung's disease

acetylcholinesterase, calretinin, barium enema, colon motility, colon resection, colonoscopy, frozen section, Hirschsprung disease, histochemistry, histopathology, immunohistochemistry, intestine innervation, letter, preoperative evaluation, priority journal, rectum biopsy, surgical approach, surgical technique, transanal endorectal pullthrough, treatment planning