Pembrolizumab-Associated Immune-Related Cystitis Mimicking Urothelial Malignancy as Part of a Multi-organ Immune-Related Adverse Event (irAE) Phenotype in a Patient With Metastatic Squamous Cell Lung Cancer: A Case Report and Literature Review
Immune checkpoint inhibitors (ICIs) have revolutionized the treatment of metastatic non-small-cell lung cancer (NSCLC) but can cause a broad spectrum of immune-related adverse events (irAEs) affecting multiple organ systems. Although common irAEs are well characterized, immune-related cystitis is rare and may pose a si...