23-year-old man (patient 1) with chest pain and shortness of breath during exercise. Systemic signs of inflammation, reduced left ventricle function (ejection fraction, 42%), and MRI led to diagnosis of acute myocarditis. Contrast-enhanced turbo FLASH images in horizontal long-axis (A) and short-axis (B) orientations show clearly demarcated intramural late enhancement in parts of septum and anterior, anteroseptal, and lateral walls (segments 1, 6–8, 11–14). Small subepicardial rim is seen in inferior wall (segment 10) (C). T2-weighted turbo spin-echo image in horizontal long-axis orientation shows hyperintense signal in corresponding areas, indicating edema.
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