Dr. Charles Lau discusses the importance of consistent and accurate terminology in describing the spread of lung cancer to mediastinal and hilar lymph nodes. He emphasizes the significance of the International Association for the Study of Lung Cancer (IASLC) lymph node map, which categorizes thoracic lymph nodes into 14 districts or stations. Dr. Lau explains the boundaries and distinctions between various lymph node stations, providing insights on how to differentiate them on chest CT scans. The talk underscores the critical role of this map in guiding communication among healthcare professionals, aiding in lung cancer staging, and determining appropriate treatment plans based on the extent of lymph node involvement.