Classification of eosinophilic gastrointestinal diseases

Area of Science:

• Gastroenterology
• Pathology
• Immunology

Background:

• Eosinophilic gastrointestinal diseases (EGIDs) are diagnosed via morphological assessment of eosinophil infiltration in gastrointestinal biopsies.
• Eosinophils, while indicators of inflammation, do not pinpoint a specific disease in most cases.
• Eosinophil morphology includes intact cells and extracellular granules post-degranulation.

Purpose of the Study:

• To elucidate the diagnostic criteria and implications of eosinophil infiltration in gastrointestinal tissues.
• To differentiate the role of eosinophils in specific EGIDs versus general inflammation.

Main Methods:

• Histopathological examination of biopsy and resection specimens from the oesophagus, stomach, and bowel.
• Evaluation of eosinophil localization, density, and morphology.
• Correlation of eosinophil presence with clinical manifestations and other histopathological findings.

Main Results:

• No fixed eosinophil count defines a specific disease; diagnosis relies on infiltration patterns.
• Elevated eosinophils are associated with allergic conditions (colitis, proctocolitis, gastroenteritis, oesophagitis).
• Eosinophilia can also suggest drug reactions, parasitic infections, inflammatory bowel disease (IBD), reflux oesophagitis, coeliac disease, and certain malignancies.

Conclusions:

• Eosinophil infiltration is a key diagnostic feature in various gastrointestinal conditions, primarily inflammatory and allergic.
• The interpretation of eosinophil presence must consider clinical context and associated histopathological findings.
• Eosinophils serve as important biomarkers across a spectrum of gastrointestinal pathologies.