Case Presentation: We present a case of early and atypical checkpoint inhibitor pneumonitis (CIP) in an elderly female with chronic obstructive pulmonary disease (COPD) who received just two infusions of Pembrolizumab for stage III non-small cell lung carcinoma (NSCLC). Before starting immunotherapy, she had been receiving chemotherapy with carboplatin and paclitaxel for 6 months. The [...]