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Consensus atlas for cT3N0M0 upper thoracic esophagus cancer. Gross tumor volume (GTV) of the primary tumor is depicted in red, representing the actual tumor size. The clinical target volume (CTV) of the primary tumor, illustrated in blue, is achieved by expanding the GTV 2.0 cm in the cranio-caudal direction and 0.5 cm radially along the esophageal wall. The planning target volume (PTV), shown in green, is created by a uniform expansion of 0.5 cm around the entirety of the CTV
