Trisomy 21

Recent changes in Down syndrome management reflect evolving understanding of outcomes and physiology. Surgical practice has shifted away from routine permanent colostomy: most Down syndrome patients with anorectal malformations achieve bowel control without it, comparable to non-Down syndrome patients. Recognition that Down syndrome patients have a weaker immune barrier has clarified why they experience worse enterocolitis in Hirschsprung disease. Sigmoidectomy for segmental dysmotility has been abandoned based on new data. Diagnostic protocols now emphasize that distal colostogram remains necessary even in Down syndrome, since 5% have fistula despite the typical presentation without one.

Experts disagree on fistula prevalence in Down syndrome anorectal malformation. One expert states that 95% have the no-fistula type, while another recommends distal colostogram in all Down syndrome patients to rule out 5% with fistula—a position implying higher fistula rates than 5%. Additionally, experts differ on management strategy: some advocate colostomy for Down syndrome patients based on presumed absence of fistula, whereas the approach for non-Down syndrome patients may differ. No other major disagreements on Down syndrome management appear in the library's recordings.