Includes nodes immediately adjacent to the mainstem bronchus and hilar vessels including the proximal portions of the pulmonary veins and main pulmonary artery

Upper border: the lower rim of the azygos vein on the right; upper rim of the pulmonary artery on the left

Lower border: interlobar region bilaterally 

Border between right and left: Above the carina: the midline of the trachea; Below the carina: vertical line drawn from the medial margin of the both main bronchi

source : IASLC Map



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