Segmental aganglionosis of the appendix.

Area of Science:

• Pediatric Surgery
• Gastroenterology
• Pathology

Background:

• Hirschsprung's disease is characterized by the absence of ganglion cells in the colon.
• The appendix is traditionally considered unreliable for diagnosing total colonic aganglionosis.
• An index case presented with an aganglionic appendix but a ganglionic ascending colon.

Observation:

• Appendices from 36 Hirschsprung's disease cases and 10 controls were analyzed for ganglion cells.
• No ganglion cells were found in appendices from patients with total colonic aganglionosis.
• Appendices from patients with sigmoid or longer segment Hirschsprung's disease showed variable ganglion cell presence, similar to controls.

Findings:

• The index case, initially suspected of total colonic aganglionosis due to an aganglionic appendix, was later found to have a ganglionic ascending colon.
• No significant difference in ganglion cell counts was observed between controls and Hirschsprung's disease cases with less than total colonic involvement.
• The study suggests the appendix may not be a definitive indicator in all Hirschsprung's disease presentations.

Implications:

• This challenges the established diagnostic protocols for Hirschsprung's disease.
• It highlights the possibility of segmental Hirschsprung's disease with "skip areas" of ganglionic tissue, even in the appendix.
• Further research is needed to refine diagnostic strategies for colonic aganglionosis.