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Computed tomography scans. a) On the initial medical examination, right pleural effusion and a mass in the middle lung field were observed. b) After 3 months of gefitinib treatment, an improvement in the right pleural effusion and a decrease in the size of the primary lesion were observed. c) After 5 months of gefitinib treatment, progression of the size of the mass was observed. d) Infiltration and atelectasis of the right lung were observed.
