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Difficulty: MediumPathology and Biopsy Interpretation

A 28-year-old man presents to the clinic with a 3-year history of progressively worsening dysphagia to solid foods. He reports that food often feels "stuck in his chest," and he required emergency endoscopy 6 months ago to remove an impacted piece of meat. His medical history is notable for allergic rhinitis and childhood asthma. He has tried a 2-month course of daily omeprazole with no significant improvement in his symptoms. Physical examination is unremarkable. An upper endoscopy is performed and shows multiple stacked circular rings (trachealization), linear furrows, and scattered whitish exudates in the mid and distal esophagus. Biopsy specimens are obtained from the proximal and distal esophageal mucosa. Which of the following microscopic findings is most likely to be present on histopathologic interpretation of these biopsies?

  1. Squamous epithelium with >15 intraepithelial eosinophils per high-power fieldAnswer
  2. B
    Basal zone hyperplasia and elongation of papillae with rare intraepithelial eosinophils
  3. C
    Replacement of stratified squamous epithelium by columnar epithelium with goblet cells
  4. D
    Absence of myenteric (Auerbach) plexus ganglion cells with localized chronic inflammation
  5. E
    Dense neutrophilic infiltrate with fungal pseudohyphae and budding yeast

Answer

Squamous epithelium with >15 intraepithelial eosinophils per high-power field
The correct answer accurately describes the defining histopathologic criterion for eosinophilic esophagitis (EoE). EoE is a chronic, immune-mediated disease characterized clinically by esophageal dysfunction (e.g., solid-food dysphagia, food impaction) and pathologically by eosinophil-predominant inflammation. The patient's history of atopy, lack of response to a proton pump inhibitor, and classic endoscopic findings (trachealization, linear furrows, white mucosal exudates) strongly suggest EoE. Biopsies taken from both the proximal and distal esophagus will reveal >15 eosinophils per high-power field, distinguishing it from GERD, which primarily affects the distal esophagus and has a much lower eosinophil count.

Step-by-Step Solution

1
Analyze the clinical presentation.
The patient is a young male with atopy (allergic rhinitis, asthma) presenting with solid-food dysphagia, a history of food impaction, and failure to respond to proton pump inhibitors (PPIs).
Identifying the demographic and symptomatic profile points toward an immune-mediated esophageal condition rather than simple acid reflux or a purely mechanical obstruction.
2
Evaluate the endoscopic findings.
Endoscopy shows stacked circular rings (trachealization), linear furrows, and whitish exudates in both the mid and distal esophagus.
These findings are classically associated with eosinophilic esophagitis (EoE), whereas strictures or esophagitis isolated to the distal esophagus would be more typical of GERD.
3
Determine the expected histopathologic findings that establish the diagnosis.
The diagnostic hallmark of EoE on esophageal biopsy is a dense intraepithelial eosinophilic infiltrate, specifically quantified as >15 eosinophils per high-power field (HPF), often accompanied by eosinophilic microabscesses (which correspond to the white exudates seen on endoscopy).
Correlating the suspected diagnosis with the definitive pathologic criteria is required to confirm EoE and differentiate it from other causes of esophagitis.

Key Concept

Eosinophilic esophagitis is diagnosed clinically by symptoms of esophageal dysfunction (dysphagia, food impaction) and histopathologically by the presence of >15 intraepithelial eosinophils per high-power field on esophageal mucosal biopsy.
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Topics

Pathology and Biopsy Interpretation

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