This case illustrates MR imaging features of acute myocarditis and reviews the assessment according to the Lake Louise criteria ^1,2.

Both main criteria are fulfilled following the updated new version ¹:

• myocardial edema (based on T2w images or T2 mapping)
• non-ischemic myocardial injury  (abnormal native T1, ECV or LGE)

There are no supportive criteria (pericarditis, systolic dysfunction) present.

Also, three out of three criteria (edema, EGE, LGE) of the old version ² are met.

After the exclusion of coronary artery disease or recent childbirth and in the absence of any systemic disease as rheumatoid arthritis, systemic lupus erythematosus (SLE), or sarcoidosis, and in view of the supportive clinical findings, the diagnosis of myocarditis can be rated as certain.