BACKGROUND: Children with Hirschsprung disease (HSCR) proximal to the splenic flexure or those needing a redo pull-through (PT) are at risk for tension and ischemia of the PT which could result in leak, stricture, or loss of ganglionated bowel. Colonic derotation is a technique used to minimize tension and avoid duodenal obstruction. The aim of this study was to describe this technique and outcomes in a series of patients requiring this intervention.
METHODS: All patients underwent initial diversion and colonic mapping. The derotation procedure involves mobilization of the remaining colon, counterclockwise rotation via the stoma closure site, placement of the pull through (the right colon) lying on the right of the pelvis, and ligation of the middle colic artery with preservation of the marginal branch running from the ileocolic artery. This maneuver prevents compression of the duodenum by the mesenteric vessels and allows for an isoperistaltic, tension-free anastomosis. Intraoperative indocyanine green fluorescence angiography (ICG-FA) was utilized in many of the cases to map the blood supply of the pull-through colon. We reviewed outcomes for all children with HSCR who underwent colonic derotation from 2014 to 2023. Descriptive statistics were performed.
RESULTS: There were 37 children included. Most were male (67.5%) with the original transition zone proximal to the rectosigmoid (81.1%). The median age at PT was 9.3 months [6.1-39.7]. Median operative time was 6.6 h [4.9-7.4] and 19 cases (51.4%) used ICG-FA. Most children had no 30-day postoperative complications (67.6%); in those who did develop complications, readmissions for electrolyte imbalance was most common (50.0%). There were zero cases of anastomotic leak at PT anastomosis. At long-term follow up, median 4.4 years [2.3-7.0], three children (8.1%) developed an anastomotic stricture, all were amenable to anal dilation, and five experienced episodes of enterocolitis (14.7%). Most children had between 1 and 4 stools per day (58.8%).
CONCLUSIONS: Colonic derotation is a useful strategy to ensure well-perfused colonic length, protect the marginal artery blood supply, avoid duodenal compression, and ensure a tension-free anastomosis with minimal complications.
METHODS: Original research, retrospective cohort.
METHODS: III.

OBJECTIVE: The risk factors for postoperative Hirschsprung-associated enterocolitis (HAEC) are still incompletely understood, especially age at which surgery is performed. Therefore, the aim of this study was to identify the risk factors for the development of postoperative HAEC in children operated during infancy.
METHODS: Thirty-five children who had undergone radical surgery for Hirschsprung disease (HD) during infancy were included in the study. They were divided into two groups; those who developed postoperative HAEC (HAEC, 14 patients) and those who did not (no HAEC, 21 patients). Their medical records were retrospectively reviewed for clinical details.
RESULTS: Developing postoperative HAEC was significantly associated with long-segment HD (p = 0.020) and the age at radical surgery (p = 0.0241). No other factors had a significant association with postoperative HAEC. In the patients who developed postoperative HAEC (n = 14), those with Trisomy 21 had significantly longer hospitalizations than those without. Patients with long-segment HD had a higher hospitalization rate than those with short-segment HD.
CONCLUSIONS: This study clearly showed that long-segment HD and older age at radical surgery are risk factors for developing postoperative HAEC.

Epidemiological studies have suggested that there may be ethnic variations in the prevalence of Hirschsprung disease (HD) but no study has systematically investigated this issue or potential ethnic variations in the extent of aganglionosis in HD. This study aimed to investigate this in a childhood population in New Zealand.
A multicentre national retrospective review was undertaken of all newly diagnosed cases of HD at each of the four paediatric surgical centres in New Zealand over a 16-year period (January 2000 to December 2015). Original histological, radiological and operative reports were obtained and analysed. Self-identified ethnicity was recorded from admission documents. Birth statistics were obtained from Statistics New Zealand.
A total of 246 cases of HD were identified. The prevalence of HD was 1:3790 live births for European, 1:6610 among Māori, 1:1834 among Pacific Peoples, 1:3847 among Asian and 1:5694 among Middle Eastern. The prevalence of HD was statistically significantly greater in Pacific Peoples (P < 0.0005). The proportion of children with long-segment HD was also significantly greater in Pacific and Asian populations than others (P = 0.04). These findings were not due to differences in the proportion of familial cases of HD among the different populations.
The prevalence and phenotype of HD varies significantly between different ethnic groups within New Zealand. This may well be related to variations in the frequencies of HD-associated gene mutations within these populations.

Hirschsprung disease (HSCR) is a congenital disorder characterized by intestinal aganglionosis leading to pseudoobstruction. The majority of cases are limited to the rectum or rectosigmoid (S-HSCR). A variably longer segment can be affected (L-HSCR), which may show many deviations from S-HSCR. We retrospectively reviewed 48 clinicopathologically confirmed total cases of HSCR at a single institution in a 21-year period to identify L-HSCR cases and determine their deviations from known features of S-HSCR. Eight L-HSCR cases were found where aganglionosis extended to the terminal ileum (7/8) or to the splenic flexure (1/8). L-HSCR lacked male preponderance and was in contrast more common in females (6/8). Associated anomalies included congenital heart disease (2) and neonatal hypothyroidism (1), previously underreported associations. The clinical diagnosis of L-HSCR was often delayed (average age at diagnosis 13 days) and the diagnosis was more often made operatively (5/8) rather than on rectal suction biopsy (3/8). Histologically, apart from aganglionosis, neural hyperplasia was either absent or focal, compounding the diagnostic difficulty. Although the number of cases in our study was limited due to the rarity of L-HSCR, this study still highlights the spectrum of deviations of L-HSCR from known clinicopathological features of S-HSCR.