"Thoracic lymph nodes are divided into 14 stations as defined by the International Association for the Study of Lung Cancer (IASLC) 1, principally in the context of oncologic staging. For the purpose of prognostication, the stations may be grouped into seven zones. The IASLC definitions leave some ambiguous regions which can lead to misclassification 3."
"left (1L) and right (1R) are divided by the midline of the trachea"
"left (2L) and right (2R) are divided along the left lateral border of the trachea, not the midline"
"inferior border of 2L: superior border of the aortic arch, i.e. abuts 4L"
"inferior border of 2L: superior border of the aortic arch, i.e. abuts 4L"
"left (4L) and right (4R) are divided along the left lateral border of the trachea, not the midline"
"4L:"
"superior border: superior border of the aortic arch, i.e. abuts 2L"
"these nodes are in the mediastinum (N2) and their surgical management mirrors that of 4R/4L lymph nodes, hence, pre-carinal nodes are best classified as part of the 4R/4L stations 2"
"these nodes are in the mediastinum (N2) and their surgical management mirrors that of 4R/4L lymph nodes, hence, pre-carinal nodes are best classified as part of the 4R/4L stations 2"
"Station 3A and 3P: pre-vascular and retrotracheal nodes"
"pre-carinal nodes"
"these nodes are in the mediastinum (N2) and their surgical management mirrors that of 4R/4L lymph nodes, hence, pre-carinal nodes are best classified as part of the 4R/4L stations 2"
"station 1 nodes are outside the mediastinum and staged as an N3 disease; despite this, they can sometimes be treated with radical intent if they are encompassable in a radiotherapy field"
"left (4L) and right (4R) are divided along the left lateral border of the trachea, not the midline"
"inferior border - left: upper border of the lower lobe bronchus"
"inferior border - right: lower border of bronchus intermedius"
"Station 3A and 3P: pre-vascular and retrotracheal nodes"
Expected headings
"Supraclavicular zone"
"Station 1 (left/right): low cervical, supraclavicular, and sternal notch nodes"
"Upper zone (superior mediastinal nodes)"
"Station 2 (left/right): upper paratracheal nodes"
"Station 3A and 3P: pre-vascular and retrotracheal nodes"
"Station 4 (left/right): lower paratracheal nodes"
"Aortopulmonary zone"
"Station 5: subaortic nodes (aortopulmonary window)"
"Station 6: para-aortic nodes, ascending aorta or phrenic"
"Subcarinal zone"
"Station 7: subcarinal nodes"
"Lower zone (inferior mediastinal nodes)"
"Station 8 (left/right): para-oesophageal nodes (below carina)"
"Station 9 (left/right): pulmonary ligament nodes"
"Hilar and interlobar zone (pulmonary nodes)"
"Station 10 (left/right): hilar nodes"
"Station 11: interlobar nodes"
"Peripheral zone (pulmonary nodes)"
"Station 12: lobar nodes"
"Station 13: segmental nodes"
"Station 14: subsegmental nodes"
"station 1 nodes are outside the mediastinum and staged as an N3 disease; despite this, they can sometimes be treated with radical intent if they are encompassable in a radiotherapy field"