Intravesical instillation of Bacillus Calmette-Guérin (BCG) has been shown to be an effective form of immunotherapy for bladder cancer. This case report describes a patient who develops systemic BCG-osis following intravesical BCG instillation and demonstrates the importance of being aware of more severe complications associated with BCG immunotherapy.
Keywords: Adverse effects; BCG immunotherapy; Bacillus Calmette‐Guérin; case report; intravesical BCG; systemic BCG‐osis.