Proposals for changes in the Mountain and Dresler mediastinal and pulmonary lymph node map

Area of Science:

• Thoracic Surgery
• Surgical Oncology
• Pulmonary Medicine

Background:

• Accurate staging of intrathoracic lymph nodes is critical for non-small cell lung cancer (NSCLC) treatment.
• The widely accepted Mountain and Dresler map for mediastinal and pulmonary lymph nodes has limitations in clarity regarding nodal station localization.

Purpose of the Study:

• To propose modifications to the existing lymph node map for NSCLC staging.
• To enhance the clarity and precision of anatomical landmarks for mediastinal lymph node identification.

Main Methods:

• Experience with extended mediastinoscopy and transcervical extended mediastinal lymphadenectomy.
• Proposed modifications based on anatomical landmarks and surgical experience.

Main Results:

• Redefinition of station boundaries using anatomical structures like the left innominate vein and tracheobronchial angles.
• Merging of stations 2 and 4 into single paratracheal stations (right and left).
• Separation of subcarinal nodes into distinct groups (subcarinal, peribronchial, periesophageal) and merging of stations 5 and 6.

Conclusions:

• The proposed modifications improve the anatomical clarity of the mediastinal lymph node map for NSCLC staging.
• Revised landmarks facilitate more precise identification of nodal stations during surgical procedures.
• These changes aim to refine staging accuracy and potentially improve treatment strategies for NSCLC.