Naclerio's sign

Q: What is the most common anatomical site for Oesophageal rupture (Boerhaave's syndrome)?

Answer:

The most common tear in Boerhaave syndrome is at the left posterolateral wall of the lower third of the esophagus, 2–3 cm proximal to the stomach. Tears are vertically oriented, 1-4 cm in length. 

On CXR it is called Naclerio's sign as a V-shaped air collection. One limb of the V is produced by mediastinal air outlining the left lower lateral mediastinal border. The other limb is produced by air between the parietal pleura and medial left hemidiaphragm

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Reference:

Korn O, Oñate JC, López R (2007). "Anatomy of the Boerhaave syndrome". Surgery 141 (2): 222–8.