Figure 1.

(A) Axial and (B) coronal views of the noncontrast computed tomography scan images before the initiation of pembrolizumab. [Yellow Arrow] A 5-cm mass-like area in the superior segment of the left lower lobe can be seen. (C) Axial and (D) coronal views of the noncontrast computed tomography scan images 3 months later (3 weeks after his first and only dose of pembrolizumab). [Red Arrow] Progression of the disease now at 10.8 cm in size and with new right lower lobe nodules.