azygoesophageal recess

az·y·go·e·so·pha·ge·al re·cess

the region below the azygos vein arch in which the right lung intrudes into the mediastinum between the heart and vertebral column, bordered on the left by the esophagus. Radiologically, on a frontal chest image, the vertical interface between the right lung and the esophagus.
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4 cm in the right lower lobe of the lung abutting the pleura with enlarged mediastinal lymph nodes in the azygoesophageal recess (Figure 2).