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. Author manuscript; available in PMC: 2022 Sep 1.
Published in final edited form as: Radiol Clin North Am. 2021 Sep;59(5):875–886. doi: 10.1016/j.rcl.2021.05.010

Figure 6.

Figure 6.

Pneumonitis in a 61-year-old man with metastatic squamous cell carcinoma of the left tonsil on pembrolizumab. CT (A) and fused FDG PET/CT images (B) acquired 7.5 months after initiation of treatment demonstrate FDG-avid nodular opacities in the lungs in a peribronchovascular distribution consistent with pneumonitis; at the time of the scan the patient had shortness of breath and cough. Pembrolizumab was held and steroids were initiated, and the patient’s symptoms improved. Follow-up CT (C) and fused FDG PET/CT images (D) acquired 4 months later demonstrate resolution of the pneumonitis.