Epiphrenic Diverticulum: The Hidden Esophageal Disorder Behind Dysphagia, Regurgitation, and Weight Loss — A Comprehensive Medical Imaging Guide

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Epiphrenic Diverticulum: A Rare but Important Cause of Dysphagia and Regurgitation

Imagine a patient who has struggled with swallowing difficulties for years.

Meals take longer.

Food seems to get stuck.

Undigested material unexpectedly returns to the mouth hours after eating.

Progressive weight loss follows.

Many patients are initially treated for reflux disease, esophageal infection, or nonspecific swallowing disorders. However, hidden behind these symptoms may be a rare structural abnormality known as Epiphrenic Diverticulum.

Although uncommon, this condition represents one of the most fascinating intersections between gastroenterology, thoracic surgery, and medical imaging.

Modern radiology interpretation, especially CT imaging and contrast esophagography, plays a pivotal role in establishing the diagnosis.

This article presents a comprehensive review of epiphrenic diverticulum using a real clinical case, imaging findings, differential diagnosis, diagnostic workflow, treatment strategies, and long-term prognosis.

A Real Patient Story

A 67-year-old woman presented with:

  • Intermittent dysphagia for solid foods

  • Regurgitation of liquids and solids

  • Recurrent esophageal candidiasis for 11 years

  • Unintentional weight loss of 7.7 kg

Over three years, symptoms gradually worsened.

Chest radiography revealed an unexpected abnormality adjacent to the right heart border.

Further imaging ultimately demonstrated a giant epiphrenic diverticulum measuring approximately 10 × 15 cm associated with achalasia.

After laparoscopic diverticulectomy, Heller myotomy, and Dor fundoplication, the patient became completely symptom-free and remained well two years later.

What Is an Epiphrenic Diverticulum?

An epiphrenic diverticulum is a pulsion diverticulum arising from the distal esophagus, typically within the lower 10 cm of the esophageal body immediately above the diaphragm.

Unlike traction diverticula, which result from external inflammatory pulling forces, epiphrenic diverticula develop because elevated intraluminal pressure forces the mucosa and submucosa through weak points in the muscular wall.

Consequently, they are considered:

  • False diverticula

  • Pulsion diverticula

  • Acquired lesions

Most occur on the right posterolateral wall of the distal esophagus.

Epidemiology

Epiphrenic diverticula are rare.

Reported prevalence:

ParameterValue
General population  <0.02%
Esophageal diverticula among GI disorders  Rare
Age group  50–80 years
Sex distribution  Slight male predominance
Associated motility disorder  75–100%

Most patients have an underlying esophageal motility disorder, such as:

  • Achalasia

  • Diffuse esophageal spasm

  • Nutcracker esophagus

  • Hypercontractile esophagus

The strong association with motility disorders explains why imaging evaluation should never stop at identifying the diverticulum alone.

Pathophysiology

Step 1: Esophageal Outflow Obstruction

The lower esophageal sphincter fails to relax appropriately.

Commonly:

  • Achalasia

  • Functional obstruction

occur.

Step 2: Increased Intraluminal Pressure

During swallowing:

Food boluses generate elevated pressure against a closed distal esophagus.

Step 3: Herniation of Mucosa

The mucosal and submucosal layers protrude through weak muscular fibers.

This produces the diverticular sac.

Step 4: Progressive Enlargement

Repeated pressure cycles lead to:

  • Enlargement

  • Food retention

  • Stasis

  • Inflammation

  • Infection

Large diverticula may exceed 10 cm in diameter.

Clinical Presentation

Symptoms vary considerably.

Common Symptoms

Dysphagia

Most common symptom.

Usually affects solids first.

Regurgitation

Undigested food may return hours after meals.

Weight Loss

Reduced intake leads to progressive weight reduction.

Chest Pain

Intermittent retrosternal discomfort.

Halitosis

Food retention causes bacterial overgrowth.

Recurrent Aspiration

Can result in:

  • Aspiration pneumonia

  • Chronic cough

  • Nocturnal choking

The presented patient exhibited several classic features, including dysphagia, regurgitation, chronic candidiasis, and significant weight loss.

Medical Imaging Evaluation

Medical imaging remains the cornerstone of diagnosis.

Figure 1. Chest Radiograph

Posteroanterior chest radiograph demonstrating a right paracardiac opacity containing an air-fluid level.

Radiologic Interpretation

The air-fluid level adjacent to the right cardiac border strongly suggests a fluid-containing esophageal abnormality rather than a pulmonary lesion.

Diagnostic Contribution

This image provides the first clue prompting further esophageal evaluation.

The finding can mimic:

  • Hiatal hernia

  • Mediastinal cyst

  • Pulmonary mass

In this patient, chest radiography identified the abnormality that led to definitive imaging studies.

Figure 2. Contrast Esophagogram

Barium esophagram demonstrating a giant distal esophageal diverticulum measuring approximately 10 × 15 cm.

Radiologic Interpretation

The diverticulum communicates with the distal esophageal lumen and demonstrates contrast retention.

Associated findings include:

  • Esophageal dilation

  • Tortuosity

  • Delayed emptying at the gastroesophageal junction

These findings strongly support achalasia.

Diagnostic Contribution

The esophagogram establishes:

  • Size

  • Location

  • Functional obstruction

  • Relationship to achalasia

This remains the gold standard imaging study.

Figure 3. CT Scan of the Chest

Axial CT image demonstrating a large air- and fluid-filled diverticular sac arising from the distal esophagus.

Radiologic Interpretation

CT confirms:

  • Diverticular morphology

  • Mediastinal location

  • Relationship to adjacent structures

  • Absence of perforation

CT additionally evaluates complications, including:

  • Aspiration

  • Mediastinitis

  • Malignancy

Diagnostic Contribution

CT imaging is particularly valuable when chest radiographs are inconclusive or when surgical planning is required.

CT Imaging Findings of Epiphrenic Diverticulum

Characteristic CT features include:

Air-fluid level

Most common appearance.

Thin-walled sac

Communicating with the distal esophagus.

Food debris

Frequently visible.

Distal esophageal dilation

Suggestive of motility disorder.

Gastroesophageal junction narrowing

Supports achalasia diagnosis.

Adjacent aspiration changes

May be present.

Radiologists should carefully inspect the distal esophagus whenever a mediastinal air-fluid collection is identified.

Differential Diagnosis

DiseaseKey Imaging Finding
Hiatal hernia   Gastric folds within the thorax
Esophageal duplication cyst   Fluid-filled without air
Mediastinal abscess   Thick enhancing wall
Bronchogenic cyst   No esophageal communication
Achalasia without diverticulum   Dilated esophagus only
Esophageal carcinoma   Irregular wall thickening
Epiphrenic diverticulum   Air-fluid sac communicating with the distal esophagus

Diagnostic Workflow

Step 1

Clinical suspicion

Symptoms:

  • Dysphagia

  • Regurgitation

  • Weight loss

↓

Step 2

Chest X-ray

↓

Step 3

Contrast Esophagography

↓

Step 4

Upper Endoscopy

↓

Step 5

CT Scan

↓

Step 6

Esophageal Manometry

↓

Final Diagnosis

Epiphrenic Diverticulum ± Achalasia

Role of Endoscopy

Upper endoscopy serves multiple purposes:

  • Confirm diverticular opening

  • Assess mucosal integrity

  • Exclude malignancy

  • Evaluate infection

In this patient, endoscopy confirmed both the diverticulum and chronic fungal infection.

Treatment

Management depends on:

  • Symptoms

  • Size

  • Motility disorder

Conservative Management

Appropriate for:

  • Small diverticula

  • Minimal symptoms

Includes:

  • Dietary modification

  • Acid suppression

  • Monitoring

Surgical Management

Recommended for:

  • Large diverticula

  • Significant dysphagia

  • Aspiration

  • Weight loss

Procedures include:

Diverticulectomy

Removal of diverticulum.

Heller Myotomy

Treats underlying achalasia.

Dor Fundoplication

Reduces postoperative reflux.

The presented patient underwent all three procedures successfully.

Prognosis

Long-term outcomes are excellent.

Most patients experience:

  • Resolution of dysphagia

  • Improved nutrition

  • Reduced aspiration

  • Better quality of life

In this case, the patient remained symptom-free two years after surgery.

Key Takeaways

✓ Epiphrenic diverticulum is a rare distal esophageal pulsion diverticulum.

✓ Most patients have an underlying motility disorder, especially achalasia.

✓ Chest radiography often reveals an air-fluid level near the heart.

✓ Contrast esophagography remains the diagnostic gold standard.

✓ CT scan diagnosis provides critical anatomical detail.

✓ Surgical treatment combining diverticulectomy and myotomy offers excellent outcomes.

Frequently Asked Questions (FAQ)

Is an epiphrenic diverticulum cancer?

No. It is generally benign, although chronic stasis may rarely predispose to malignancy.

What is the best imaging test?

Contrast esophagography remains the most informative study, while CT provides complementary anatomical information.

Can a CT scan diagnose epiphrenic diverticulum?

Yes. CT frequently demonstrates a characteristic air-fluid-filled distal esophageal sac.

Is surgery always necessary?

No. Small asymptomatic diverticula may be managed conservatively.

Why is achalasia commonly associated?

Because increased intraluminal pressure generated by achalasia promotes diverticular formation.

Educational Quiz

Question 1. Which imaging study is considered the diagnostic gold standard for epiphrenic diverticulum?

A. MRI

B. PET-CT

C. Esophagography

D. Ultrasound

E. Echocardiography

Correct Answer: C. Esophagography. Explanation: Contrast esophagography directly demonstrates diverticular size, communication, and esophageal emptying.

Question 2. Which disorder is most commonly associated with epiphrenic diverticulum?

A. GERD

B. Barrett esophagus

C. Achalasia

D. Gastric ulcer

E. Crohn's disease

Correct Answer: C. Achalasia. Explanation: Most patients have a concomitant esophageal motility disorder, particularly achalasia.

Question 3. What is the most characteristic chest radiographic finding?

A. Pneumothorax

B. Pleural effusion

C. Mediastinal widening

D. Air-fluid level adjacent to the heart

E. Rib destruction

Correct Answer: D. Air-fluid level adjacent to the heart. Explanation: Retained food and fluid within the diverticulum create a characteristic mediastinal air-fluid level.

Recommended Reading

[1] C. Herbella and M. Patti, “Modern pathophysiology and treatment of esophageal diverticula,” Langenbeck's Archives of Surgery, vol. 397, no. 1, pp. 29–35, 2012. DOI: https://doi.org/10.1007/s00423-011-0843-0

[2] J. Zaninotto et al., “Esophageal motility disorders and diverticula,” World Journal of Surgery, vol. 35, pp. 156–161, 2011. DOI: https://doi.org/10.1007/s00268-010-0834-3

[3] M. Patti et al., “Esophageal diverticula and surgical management,” Annals of Surgery, vol. 256, pp. 879–885, 2012. DOI: https://doi.org/10.1097/SLA.0b013e31827324df

[4] D. Kahrilas et al., “Achalasia,” Nature Reviews Disease Primers, vol. 3, 2017. DOI: https://doi.org/10.1038/nrdp.2017.81

[5] J. Richter, “Oesophageal motility disorders,” Lancet, vol. 388, pp. 83–93, 2016. DOI: https://doi.org/10.1016/S0140-6736(15)60687-4

[6] B. Levine et al., “Radiographic evaluation of esophageal diverticula,” AJR American Journal of Roentgenology, vol. 188, pp. 110–118, 2007. DOI: https://doi.org/10.2214/AJR.05.1718

[7] A. Vaezi et al., “ACG Clinical Guidelines: Diagnosis and Management of Achalasia,” American Journal of Gastroenterology, vol. 115, pp. 1393–1411, 2020. DOI: https://doi.org/10.14309/ajg.0000000000000731

[8] M. Herbella and F. Schlottmann, “Esophageal Diverticula,” Annals of Esophagus, vol. 3, 2020. DOI: https://doi.org/10.21037/aoe.2020.02.03

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