what is the role of anal dilations after endorectal pullthrough in Hirschsprungs disease?

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what is the role of anal dilations after endorectal pullthrough in Hirschsprungs disease?

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My son was born with HD and had the pull through surgery. We had to do anal dilation for a few months. We were told this was to help scar tissue from making the sphincter too narrow. Hope this helps.