PMC9795177_01
Comparison of mediastinal window CT images in four different periods: (A) Before treatment initiation (2020-10-12); (B). After two cycles of chemotherapy (2020-11-25); (C) At the end of the 5th fractionation of radiotherapy (2020-12-9); (D) At the end of the 10th fractionation of radiotherapy (2020-12-16). CT, computed tomography.
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The tumor diameter was 52.85 mm (mediastinal window images were uniformly used for measurement and comparison) with atelectasis ( Figure 1A ). The first treatment cycle began on October 16, 2020, and the two-cycle efficacy was evaluated as stable disease (  Figure 1B  ). On December 9, 2020, enhanced CT performed during radiotherapy to reposition the patient revealed that the tumor had significantly reduced in size to 21.16 mm (  Figure 1C  ). It remained this size for 4 months (  Figure 1D  ).