A 71-year-old woman with a 10-year history of GERD and a known large hiatal hernia (>5 cm) presents with transfusion-dependent iron-deficiency anemia (Hb 8.6 g/dL, MCV 71, ferritin 6 ng/mL). Upper endoscopy reveals linear erosions and shallow ulcers on the crests of gastric mucosal folds at the diaphragmatic indentation within the hernia sac, as marked **B** in the diagram. Two prior colonoscopies were unremarkable, and biopsies exclude malignancy and H. pylori infection. Which of the following best describes the pathophysiological mechanism underlying the lesions marked **B**?
A. Vascular ectasia and telangiectasia of the gastric mucosa secondary to portal hypertension and chronic venous stasis
B. Chronic H. pylori-associated inflammation with intestinal metaplasia and loss of mucosal integrity at the gastroesophageal junction
C. Acid-peptic injury from increased gastric acid secretion in the setting of a large hiatal hernia, resistant to standard-dose PPI therapy
D. Mechanical trauma from repeated rubbing of gastric mucosa against the diaphragmatic crura during respiration and deglutition, combined with ischemia from venous congestion at the constriction point
Explanation
Why option 1 is correct
The lesions marked B are Cameron lesions (Cameron erosions/ulcers), first described by Cameron in 1986. These are linear erosions and ulcers located on the crests of mucosal folds at the diaphragmatic impression within a large hiatal hernia sac. The primary pathophysiological mechanism is multifactorial: (1) mechanical trauma from repeated rubbing of the gastric mucosa against the diaphragmatic crura during respiration and deglutition (the most widely accepted explanation), and (2) ischemia from venous congestion at the constriction point where the hernia sac narrows as it passes through the diaphragmatic hiatus. These two mechanisms work synergistically to cause chronic, occult blood loss and transfusion-dependent iron-deficiency anemia—the hallmark clinical presentation in older patients with large hiatal hernias. The diagnosis is confirmed by careful endoscopic examination of the hernia sac with attention to the diaphragmatic impression level.
Why each distractor is wrong
Option 2: While acid-peptic injury is one component of the multifactorial pathogenesis, it is NOT the primary mechanism and is not the most accepted explanation. Notably, Cameron lesions occur even in patients on adequate PPI therapy, indicating that acid suppression alone is insufficient to prevent their formation. The mechanical and ischemic factors are dominant.
Option 3: H. pylori infection is explicitly excluded in this case by biopsy. Moreover, H. pylori-associated gastritis typically presents with diffuse nodularity in the antrum (as seen with structure D), not with linear erosions on mucosal fold crests at the diaphragmatic indentation. This is a different pathological entity.
Option 4: Vascular ectasia and telangiectasia (as in gastric antral vascular ectasia, structure C) are associated with portal hypertension and chronic venous stasis, not with mechanical trauma and ischemia from hiatal hernia constriction. This distractor confuses Cameron lesions with a different source of obscure GI bleeding.
High-YieldNEET PG
Cameron lesions are linear erosions/ulcers at the diaphragmatic indentation in large hiatal hernias; pathogenesis is mechanical trauma + ischemia; present as chronic occult bleeding and iron-deficiency anemia; occur even on PPI therapy; first-line treatment is PPI + iron supplementation; surgery is definitive for refractory cases.
Cameron AJ. Am J Gastroenterol 1986; ASGE Obscure GI Bleeding Guidelines
Practice similar questions
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.
