Infective endocarditis of a papillary fibroelastoma on Chiari network of right atrium: a case report.

Chiari network is a rare vestigial remnant of the right valve of the sinus venosus, located in the right atrium. We report the case of a 41-year-old woman who presented with fever and chills. She had a history of infective endocarditis caused by methicillin-sensitive Staphylococcus aureus a year ago. Echocardiography did not reveal the presence of any vegetation on any of the cardiac valves. She was found to have a mass attached to Chiari network in her right atrium. This was removed surgically and revealed the presence of infective endocarditis on the papillary fibroelastoma attached to the Chiari network. This is the first report of such a case and illustrates that not all endocarditis occurs on cardiac valves.