ABC | Volume 115, Nº1, Suplement, July 2020

Case Report Pereira et al. A complicated “one segment” myocardial infarction Arq Bras Cardiol 2020; 115(1Suppl.1):25-30 and anticlotting activities of the pericardial mesothelium. 12 Its absence does not exclude the diagnosis, but other causes must be considered, 12 as illustrated by the reported clinical case. Finally, no immediate reperfusion therapy was performed on this patient, since ICA did not show any apparent occlusive lesion. Hemodynamic stabilization was the priority. Later, despite the lack of viability of the involved segment demonstrated by CMR, the posterolateral branch was revascularized as it was considered responsible for perfusion of non-necrotic segments. Conclusion This clinical case demonstrates an extremely rare MC following MI: an atypical form of incomplete or subacute LV FWR resulting in both cardiac tamponade and pseudoaneurysm formation. It also illustrates how difficult it can be to establish the differential diagnosis of chest pain with hemodynamic instability, and the etiology of a cardiac tamponade. Ultimately, it highlights the versatility and increasing applicability of CMR. Video 3 – Cardiac magnetic resonance imaging, steady-state free precession cine images, sequentially short-axis, four-chamber and three-chamber views, showing dyskinesia of the mid-segment of the lateral wall and a saccular protuberance between the mid-segments of the lateral and inferolateral walls, suggesting a pseudoaneurysm. Access the video here: https://bit.ly/2YAoPYU Author Contributions Conception and design of the research, Data acquisition and Writing of the manuscript: Pereira AR; Critical revision of the manuscript for intellectual content: Almeida AR, Cruz I, Lopes LR, Loureiro MJ, Pereira H. Potential Conflict of Interest The authors report no conflict of interest concerning the materials and methods used in this study or the findings specified in this paper. Sources of Funding There was no external funding source for this study. Study Association This study is not associated with any thesis or dissertation. Ethics Approval and Consent to Participate This article does not contain any studies with human participants or animals performed by any of the authors. 29