Inclusion Criteria:  Patients of age >= 18 years Patients must be able to understand and be willing to sign a written informed consent document. Surrogate decision-makers of patients will be allowed to consent patients for this study Patients must be receiving or have a history of receiving any ICI therapy in monotherapy or combination therapy Patients must have a suspicion of ICI-related myocarditis either by clinical presentation, biomarkers, or other diagnostic modalities  Exclusion Criteria:  Pregnant or lactating patients will be excluded