Incidental Diagnosis of Complete Congenital Absence of the Pericardium in a Middle-Aged Man Presenting with Acute Myocardial Infarction: A Case ReportShort Title (Running Head): Complete Absence of the Pericardium in AMIMohammadreza Aghajankhah, MD¹; Amir Savarrakhsh, MD¹; Shiva Parvaneh, MD²