4L - Left lower paratracheal nodes
4L - Nodi mediastinales inferiores sinistri
- Latin synonym: Area 4L
- Synonym: Station 4L; 4L - Left lower paratracheal lymph nodes
Definition
Station 4L (Left Lower Paratracheal Lymph nodes) are nodes lateral to the left border of the trachea and medial to the ligamentum arteriosum.
Boundaries:
The upper border of station 4L is the upper margin of the aortic arch.
The lower border of station 4L is the upper rim of the left main pulmonary artery (Note: on CT, in daily practice, the lower border of station 4L may be considered as the left tracheobronchial angle).
The left lateral wall of the trachea (not the midline) serves as the boundary between stations 4R and 4L.
References
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. ElSherief, Charles T. Lau, Carol C. Wu, Richard L. Drake, Gerald F. Abbott, and Thomas W. Rice RadioGraphics 2014 34:6, 16801691
