In a 39-year-old man with intermittent dysphagia presenting as a stuck sensation in the high chest/upper stomach, occasional regurgitation of undigested food, occasional halitosis, and the need to force food down with water, but no heartburn, nocturnal choking, or atopic history, what is the most likely diagnosis?

Eosinophilic Esophagitis (EoE) or Early Achalasia

Based on this clinical presentation, I suspect eosinophilic esophagitis (EoE) as the primary diagnosis, with early achalasia as an important differential that must be ruled out through objective testing.

Key Clinical Features Supporting EoE

The symptom pattern strongly suggests EoE:

• Intermittent solid food dysphagia with a "stuck" sensation in the high chest/upper stomach
• Anxiety-provoking episodes requiring water to force food down - this is classic adaptive behavior seen in EoE patients
• Episodic nature with symptom-free periods - EoE characteristically waxes and wanes
• Progressive worsening over 18 months - consistent with untreated EoE
• Age and demographics - young adult male is the typical EoE patient profile
• Absence of heartburn - makes GERD less likely as primary diagnosis
• No atopic history documented - though 50% of EoE patients lack this, it doesn't exclude the diagnosis

The occasional regurgitation of undigested food and possible halitosis suggest some degree of esophageal stasis, which can occur in both EoE (from stricturing) and achalasia.

Why Achalasia Remains on the Differential

Achalasia cannot be excluded based on history alone 1, 2. Key features that raise concern:

• Dysphagia to both solids AND liquids (you asked about liquids specifically - "sometimes" suggests some liquid dysphagia)
• Regurgitation of undigested food hours after eating
• Progressive symptoms over 18 months
• Chest/upper stomach stuck sensation

However, several features argue AGAINST classic achalasia:

• No nocturnal regurgitation or choking
• No gurgling sounds (suggests no massive esophageal dilation/megaesophagus)
• Relatively short symptom duration (18 months vs. years typical for advanced achalasia)
• Intermittent rather than constant symptoms

Diagnostic Algorithm

Step 1: High-quality upper endoscopy with biopsies 3

• Withhold PPIs for 2-4 weeks before endoscopy to maximize diagnostic yield for EoE 3
• Look for EoE findings: rings, furrows, white exudates, strictures, narrow-caliber esophagus
• Obtain at least 6 biopsies (2-3 from proximal, 2-3 from distal esophagus) even if mucosa appears normal
• EoE diagnosis requires ≥15 eosinophils per high-power field on histology
• Evaluate for Schatzki ring, strictures, or other structural abnormalities
• Assess gastroesophageal junction for retained food/saliva or "puckering" that suggests achalasia 2, 4

Step 2: If endoscopy/biopsies are non-diagnostic:

• Perform high-resolution manometry (HRM) to evaluate for achalasia or other motility disorders 1, 2
• Consider Functional Lumen Imaging Probe (FLIP) during the index endoscopy if expertise available, especially if HRM shows equivocal findings like EGJ outflow obstruction 3
• Barium esophagram can show bird-beaking (achalasia) or rings/strictures (EoE) 5, 2

Step 3: If both structural and manometric testing are inconclusive:

• FLIP can identify obstructive EGJ metrics even when HRM is normal 3
• Timed barium esophagram assesses esophageal emptying 1

Critical Pitfalls to Avoid

1. Do NOT empirically treat with PPIs and assume GERD - the absence of heartburn and presence of solid food dysphagia with adaptive behaviors makes this unlikely to be reflux-related

2. Do NOT dismiss symptoms as functional/anxiety-related because the patient reports anxiety during episodes - the anxiety is SECONDARY to the frightening sensation of food impaction 6

3. Do NOT perform endoscopy while on PPIs - this reduces sensitivity for EoE diagnosis 3

4. Do NOT rely on atopic history - absence of asthma/eczema/allergies does not exclude EoE

5. Do NOT skip biopsies if mucosa looks normal - EoE can have subtle or no visible findings in 10-30% of cases

6. Do NOT assume a single test rules out achalasia - early achalasia can have normal IRP on manometry, and FLIP or barium study may be needed 1

Immediate Management Recommendations

• Refer to gastroenterology urgently for endoscopy with biopsies (off PPIs)
• Counsel patient to avoid high-risk foods (bread, meat, rice, dry foods) until diagnosis established to prevent food impaction
• Ensure patient knows to seek emergency care if complete obstruction occurs (cannot swallow saliva)
• If EoE confirmed: initiate topical corticosteroid therapy (budesonide or fluticasone) or dietary elimination
• If achalasia confirmed: refer for pneumatic dilation, per-oral endoscopic myotomy (POEM), or laparoscopic Heller myotomy 1, 7

The 18-month progressive course with intermittent solid food dysphagia and adaptive eating behaviors in a young male without heartburn creates a compelling clinical picture for EoE, but objective testing is mandatory to differentiate from early achalasia and guide definitive treatment.