Case Presentation: 84-year-old male with a history of metastatic castration-resistant prostate cancer (mCRPC) and metastatic squamous carcinoma of the left lung presented with progressive fatigue, exertional dyspnea, chest discomfort, and diplopia following his 2nd cycle of atezolizumab infusion. After his mCRPC diagnosis in April 2021, he progressed through multiple treatments, including androgen deprivation therapy, darolutamide, [...]