A 47-year-old female, previously not treated for chronic diseases, was admitted in severe condition and with symptoms of NYHA class IV heart failure (HF) (dyspnea at rest, peripheral edema). The results of lab tests indicated an increase of inflammatory parameters (WBC: 17.63, reference range: 4.0-10.0 x 10 9 /L; CRP: 126.36 mg/l, reference range: 0.0-5.0 mg/l; procalcitonin: 0.85 ng/ml, reference range: <0.5 ng/ml) and myocardial necrosis (troponin: 111 ng /l, reference range: <47 ng/l ). The peripheral eosinophil count was within the reference ranges.Transthoracic echocardiography (TTE) showed enlargement of the heart cavities, in particular of the left ventricle (LV), akinesis of the interventricular septum, severe impairment of the ejection fraction estimated at 25%, thickening of the LV lateral wall LV intramyocardial dissection (in the form of a free-floating membrane) with the formation of an echolucent space between the