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Dilated intercellular spaces (DIS) are a key feature of eosinophilic esophagitis (EoE). Treatment for EoE, including steroids or diet, significantly reduces DIS, indicating their role in this condition.

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Area of Science:

  • Gastroenterology
  • Histopathology
  • Pediatric Medicine

Background:

  • Dilated intercellular spaces (DIS) are associated with gastroesophageal reflux disease (GERD) and can be reduced by proton pump inhibitors (PPIs).
  • DIS have been observed in various esophagitis types, but their presence and measurement in eosinophilic esophagitis (EoE) were previously uncharacterized.
  • Understanding DIS in EoE is crucial for diagnosing and monitoring the condition.

Purpose of the Study:

  • To detect and quantify dilated intercellular spaces (DIS) in pediatric eosinophilic esophagitis (EoE).
  • To assess the impact of therapeutic interventions (topical steroids and/or exclusion diet) on DIS in EoE.
  • To establish DIS as a potential morphological marker in EoE.

Main Methods:

  • Morphometry and transmission electron microscopy (TEM) were used to measure DIS in esophageal biopsies from children with EoE.
  • Measurements were taken before and after treatment in 22 children diagnosed with EoE.
  • A control group of 30 children without esophageal disorders provided comparative data.

Main Results:

  • Patients with EoE exhibited significantly higher mean DIS values (2.26 µm morphometry, 2.24 µm TEM) compared to controls (0.62 µm morphometry, 0.33 µm TEM).
  • Treatment for EoE led to a significant reduction in DIS: 1.23 µm (morphometry) and 0.98 µm (TEM) post-treatment (P < 0.0001 for both).
  • Esophageal eosinophil counts also decreased significantly from 31.8 to 6.64 (P < 0.0001) after treatment.

Conclusions:

  • Dilated intercellular spaces (DIS) are a prominent morphological characteristic of eosinophilic esophagitis (EoE).
  • Non-PPI therapies, such as topical steroids and exclusion diets, are effective in reducing DIS in EoE.
  • DIS measurement may serve as a valuable diagnostic and therapeutic response marker in EoE.