10L - Left hilar nodes

Stations 10L and 10R (Hilar Lymph nodes) are nodes that are immediately adjacent to the main-stem bronchus and hilar vessels, including the proximal portions of the pulmonary veins and main pulmonary artery, with station 10R on the right and station 10L on the left.

Boundaries:

• The upper border of station 10R is the lower rim of the azygos vein
• The upper border of station 10L is the upper rim of the pulmonary artery on the left.
• The lower borders of stations 10R and 10L are the interlobar regions 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

Sources : 

• IASLC lymph node map - https://www.iaslc.
• International Association for the Study of Lung Cancer (IASLC) Lymph Node Map: Radiologic Review with CT Illustration Ahmed H. El-Sherief, Charles T. Lau, Carol C. Wu, Richard L. Drake, Gerald F. Abbott, and Thomas W. Rice RadioGraphics 2014 34:6, 1680-1691