Canine Esophageal Stricture Study Guide

Overview and Clinical Importance

Esophageal stricture is a pathologic narrowing of the esophageal lumen caused by circumferential scar tissue formation following mucosal injury. This condition represents a significant cause of chronic regurgitation in dogs and is commonly encountered on the NAVLE. Strictures develop when esophagitis extends into the submucosal and muscular layers, triggering fibrous tissue deposition that progressively narrows the esophageal diameter. Early recognition and intervention are critical for successful management, as strictures become increasingly resistant to dilation over time.

The clinical significance of esophageal strictures lies in their profound impact on nutritional status and quality of life. Affected dogs often present with severe weight loss, aspiration pneumonia, and dehydration. Understanding the etiology, pathophysiology, diagnostic approach, and treatment options is essential for NAVLE preparation and clinical practice.

Esophageal Anatomy Review

Understanding canine esophageal anatomy is essential for comprehending stricture pathophysiology. The canine esophagus is a muscular tube extending from the pharynx to the stomach, divided into cervical, thoracic, and abdominal segments. A unique feature of the canine esophagus is that it is composed entirely of striated muscle from the cricopharyngeus muscle to the gastroesophageal junction. This differs from cats, where the distal one-third contains smooth muscle.