What are the core endoscopic visual characteristics of peptic ulcer disease (PUD)?

Core Endoscopic Visual Characteristics of Peptic Ulcer Disease

The core endoscopic visual characteristics of peptic ulcer disease include focal mucosal defects with specific high-risk stigmata classified by the Forrest classification system, most commonly presenting as single, round or oval ulcerations with characteristic locations in the duodenal bulb (particularly anterior wall) or gastric antrum.

Primary Endoscopic Features

Ulcer Morphology and Location

The typical peptic ulcer presents with distinct visual patterns on endoscopy:

• Shape and Number: Most commonly appear as single, round or oval lesions 1. Multiple lesions can occur but are less typical of classic H. pylori-associated disease.

• Size Distribution: Small ulcerations up to 0.5 cm diameter are most frequent (55% of cases) 2, though ulcers can range significantly in size. Ulcers ≥2 cm in diameter carry higher risk for treatment failure and rebleeding 3.

• Location Patterns:

  • Duodenal ulcers: Most frequently on the anterior wall of the duodenal bulb (60.33% of cases) 2
  • Gastric ulcers: Predominantly in the antrum (36.7%), followed by body (34.2%) and angle (12.7%) 1
  • Posterior duodenal ulcers, though less common, are clinically significant as they often involve the gastroduodenal artery 3

High-Risk Stigmata (Forrest Classification)

Endoscopic therapy is indicated for Forrest 1a, 1b, and 2a lesions 4, 5:

• Forrest 1a: Active spurting hemorrhage from the ulcer base
• Forrest 1b: Active oozing bleeding
• Forrest 2a: Non-bleeding visible vessel (appears as a pigmented protuberance)
• Forrest 2b: Adherent clot overlying the ulcer (may require clot removal to assess underlying lesion)
• Forrest 2c: Flat pigmented spot
• Forrest 3: Clean-based ulcer

Ulcer Base and Depth Characteristics

The character of the ulcer fundus (base) and margins provides prognostic information 6:

• Depth: Varies from superficial erosions to deep penetrating ulcers
• Base appearance: May show exposed vessels, fibrinous exudate, or clean granulation tissue
• Margins: Can be regular or irregular; irregular margins warrant biopsy to exclude malignancy in gastric ulcers

Associated Endoscopic Findings

Surrounding Mucosa

• Chronic atrophic gastritis: Present in approximately 48% of patients with peptic ulcer disease 2
• Perigastric inflammation: May be visible as mucosal edema and erythema surrounding the ulcer

Hemorrhagic Features

Hemorrhagic ulcers occur in approximately 32.9% of H. pylori-associated cases 1, presenting as:

• Active bleeding (spurting or oozing)
• Visible vessel without active bleeding
• Adherent blood clot
• Hematin staining (coffee-ground appearance)

Critical Clinical Pitfalls

Gastric Ulcer Malignancy Risk

All gastric ulcers require endoscopic biopsy to differentiate benign from malignant lesions 3, 7. This is non-negotiable as visual appearance alone cannot reliably exclude malignancy. Multiple biopsies from the ulcer margin and base are recommended.

Size-Based Risk Stratification

Ulcer size directly impacts management decisions:

• Ulcers <2 cm: Suitable for repeat endoscopic therapy if rebleeding occurs
• Ulcers ≥2 cm: Higher failure rate with endoscopic retreatment; surgical intervention should be considered earlier, particularly in unstable patients 3

Location-Specific Considerations

• Posterior duodenal ulcers: High suspicion for gastroduodenal artery involvement; require careful assessment and often triple-loop suturing if surgical intervention needed 3
• Greater curvature gastric ulcers: Less common location that should raise suspicion for alternative etiologies 1

Diagnostic Confirmation

Endoscopy definitively diagnoses peptic ulcer disease 8 and should be performed:

• Within 24 hours of presentation for hospitalized patients with upper GI bleeding 5
• With pre-endoscopy erythromycin to improve visualization by emptying gastric contents 3, 5
• With systematic documentation of ulcer location, size, and Forrest classification to guide therapy

The visual diagnosis must be complemented by H. pylori testing in all patients 3, 8 and assessment for NSAID/aspirin use, as these represent the principal etiologic factors in 42% and 36% of cases respectively 8.