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The so-called "triangle of auscultation" is a clinically important region of the posterior thorax (see Image. Triangle of Auscultation). The area is so named for its value in assessing esophageal obstruction before the advent of roentgenography. Sounds of transiting material near the stomach's cardiac orifice can be heard over this area, allowing examiners to determine the presence of esophageal obstruction.[1] The relative thinness of the structures in the triangle also permits the assessment of other thoracic structures in aid of physical examination and surgical procedures. This article discusses the anatomy of the triangle of auscultation and its importance in diagnosis and management.