Immunocheckpoint inhibitors have been widely used in the treatment of various tumors.Although the incidence rate of immunocheckpoint inhibitor related myocarditis caused by them is low,the mortality is high.Cardiac magnetic resonance imaging is the gold standard for evaluating cardiac morphology and function,and it has important clinical application value in the grading diagnosis,risk stratification,adverse prognosis prediction,and treatment monitoring of immune checkpoint inhibitor associated myocarditis.