Introduction: We present the case of a 40 year old patient, without a history of cadiac disease, that is admitted for moderate exercise induced dyspnea and paroxysmal nocturnal dyspnea, symptoms that occurred in the last 3 days. The patient also presents with productive cough and physical fatigue. We retain the history of an intercurrent respiratory infection a month ago and the subsequent antibiotic treatment for 5 days. Methods: The electrocardiogram shows sinus tachycardia, slow R wave progression V1-V3, left atrium abnormality and negative T waves V5-V6. Biologically, the patient has a small inflammatory syndrome, chronic kidney disease stage III, NT pro-BNP 9000 pg/ml. Echocardiography shows dilated left cavities, severe left ventricular systolic dysfunction (ejection fraction 15%) by global kinetic disorders, moderate mitral regurgitation and mild pulmonary hypertension. Two days aft er admission the patient experiences chest pain and hemoptysis. This raises the suspicion of pulmonary infarction that is confi rmed by CT scan. Results: Our case shows the importance of multimodal imaging and cardiac magnetic resonance especially in targeting diagnostic algorithm of patients with dilated cardiomyopathy. Management of subacute myocarditis addresses conservative treatment of left ventricular dysfunction and cardiac arrhythmias. Conclusions: Our case shows the importance of multimodal imaging and cardiac magnetic resonance especially in targeting diagnostic algorithm of patients with dilated cardiomyopathy. Management of subacute myocarditis