Histopathological alterations in irritable bowel syndrome

Area of Science:

• Gastroenterology
• Immunology
• Pathology

Background:

• Irritable bowel syndrome (IBS) is a common functional gastrointestinal disorder characterized by abdominal pain and altered bowel habits.
• Its etiopathogenesis is multifactorial, involving gut motility, visceral sensitivity, psychosocial factors, and increasingly, immune activation.

Purpose of the Study:

• To review the spectrum of morphologic changes in IBS.
• To examine the relationship between these changes and IBS pathophysiology.
• To assess the relevance of these findings to pathology practice.

Main Methods:

• Review of existing literature on IBS morphology.
• Analysis of quantitative histological, immunohistochemical, and ultrastructural findings.
• Examination of changes in mucosal immune cells and enteric nerves.

Main Results:

• Routine histology often shows no abnormalities in IBS.
• Subtle morphologic changes are detectable with advanced analyses, including alterations in lymphocytes, mast cells, enterochromaffin cells, and enteric nerves.
• These changes suggest a link between the enteric nervous system, immune processes, and central nervous system pathways.

Conclusions:

• Morphologic changes, though subtle, are present in IBS and contribute to its pathophysiology.
• Understanding these changes offers new insights into IBS mechanisms.
• These findings are relevant for pathology practice in diagnosing and understanding IBS.