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Ultracentral tumors
‘Ultracentral’ tumors: definitions
GTV directly
abutting
the central airway [Chaudhuri AA, Lung Cancer 2015]
GTV
close to or abutting
the proximal bronchial tree [Haseltine JM, PRO 2016]
When PTV
overlaps
the trachea or main bronchi [Tekatli H, JTO 2016]