Colorectal Quiz: Episode 44 - HD Frozen Section

Late-onset Hirschsprung disease patients tend to present with more subtle symptoms, more constipation, and fewer issues with enterocolitis compared to neonatal presentations.

Marking biopsy sites with prolene stitches allows for permanent pathology confirmation before pull-through, as frozen sections can be misleading.

If biopsy sites are not marked, it becomes very difficult to locate them in the future.

The laparoscopic approach allows preservation of the IMA and colonic arcade without overstretching the anus, resulting in a well-perfused, tension-free pull-through.

The laparoscopic portion of Hirschsprung pull-through minimizes the amount of anal stretch required and is very precise and elegant.

In older children with Hirschsprung disease where the transition zone level is known and can be reached transanally, a transanal-only approach may be considered.

The anastomotic donut should be cut into 4 quadrants to ensure ganglion cells are present in all quadrants, as the transition zone is sometimes not circumferential.

The commonly cited rule to go 5 centimeters above the transition zone in Hirschsprung surgery is not actually accurate, as there can be a longer transition zone in many cases.

The optimal pull-through level is usually the upper sigmoid, which provides advantages for a straight pull-through that facilitates future irrigation if needed.

Full-thickness biopsy specimens should be sent as cubes, not diamonds, with the seromuscular layer square matching the size of the mucosa square to prevent tangential cutting errors.

Ganglion cell distribution should appear like paint dripping down the sides of a paint can rather than concentric circles, which explains why biopsies in transition zones can yield variable results depending on location.

Pathologists should refuse to analyze specimens unless submucosa is included, as checking only seromuscular layers is a cardinal sin—seromuscular could have ganglion cells while submucosal layer has hypertrophic nerves.

Reoperative transanal pull-throughs have high rates of anastomotic dehiscence, partly because it is impossible to enter the anal canal in the same plane during reoperation.

Early re-operation allows release of stitches and re-anastomosis in the same plane as the initial surgery, which is why this case did not face anastomotic dehiscence.