Misdiagnosed Isolated Ruptured Mycotic Mitral Valve Aneurysm as Mitral Annulus Calcification.

Introduction: Subacute Bacterial Endocarditis (SBE) is a slowly developing type of infective endocarditis. Aneurysm is more common in this type of endocarditis. Currently, SBE is an uncommon cause of unexplained fever (FUO) because rapid diagnostic capabilities, such as echocardiography, have improved.