A 58-year-old man presents to the emergency department with acute dysphagia and chest discomfort after rapid consumption of a steak. Endoscopy reveals a smooth, concentric, thin mucosal narrowing at the squamocolumnar junction with an associated sliding hiatal hernia. The structure marked **B** in the diagram is identified as the cause of his food impaction. Which of the following best describes the anatomic and clinical characteristics of this structure?
A. A long (>2 cm) stricture in the mid-esophagus associated with severe gastroesophageal reflux and Barrett esophagus
B. Multiple stacked concentric rings with linear furrows and white exudates, typically seen in young males with a history of atopy
C. A thick (4–5 mm) muscular ring located above the squamocolumnar junction that is contractile and may relax with swallowing
D. A thin (2–4 mm) mucosal ring at the squamocolumnar junction, almost invariably associated with hiatal hernia, and the most common cause of intermittent solid food dysphagia in adults
Explanation
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The structure marked B is the Schatzki ring (lower esophageal B-ring), which is defined as a thin (2–4 mm) mucosal ring located precisely at the squamocolumnar junction (Z-line) of the distal esophagus. The clinical anchor is that it is almost invariably accompanied by a sliding hiatal hernia and is the most common cause of intermittent solid food dysphagia in adults. This patient's presentation of acute food impaction during rapid eating of meat is the classic "steakhouse syndrome" — the pathognomonic presentation of Schatzki ring. The ring is fixed and non-contractile, distinguishing it from the A-ring. (ACG Esophageal Dysphagia Guidelines 2024; Sleisenger & Fordtran 11e)
Why each distractor is wrong
Option 1 (A-ring): Describes the A-ring (muscular ring), which is thick (4–5 mm), located ABOVE the squamocolumnar junction at the upper border of the lower esophageal sphincter, is contractile, and is a rare cause of dysphagia. This is anatomically and functionally distinct from the B-ring marked in the diagram.
Option 2 (Eosinophilic esophagitis): Describes the characteristic endoscopic findings of eosinophilic esophagitis (multiple stacked rings, linear furrows, white exudates), which typically presents in young males with atopy. While EoE can coexist with Schatzki ring and should be ruled out by biopsy, it is not the structure marked B in this case.
Option 3 (Peptic stricture): Describes a peptic stricture, which is longer (>2 cm), more proximal in location, and associated with severe GERD and Barrett esophagus. Peptic strictures cause progressive dysphagia, whereas Schatzki ring causes intermittent dysphagia without progression.
High-YieldNEET PG
Schatzki ring = thin mucosal B-ring at Z-line + hiatal hernia + intermittent solid dysphagia + steakhouse syndrome; A-ring = thick muscular ring above Z-line, rare symptoms.
ACG Esophageal Dysphagia Guidelines 2024; Sleisenger & Fordtran 11e
