Multiple mycotic aneurysms reveal Staphylococcus lugdunensis endocarditis in a young patient

Mycotic aneurysms are rare, and depending on their location, can threaten functional prognosis. We report on a 17-year-old girl with no previous history of cardiovascular or infectious disease, referred to our Department of Cardiology with right hemiplegia and aphasia. A neurological evaluation revealed thrombosis of a mycotic cerebral aneurysm, complicated by ischemic and hemorrhagic infarction. Transthoracic echocardiography indicated huge, highly mobile mitral vegetation associated with a mitral regurgitation with a triple stream. Hemocultures isolated Staphylococcus lugdunensis. Shortly afterward, she developed bilateral tibial and pedal mycotic aneurysm. The patient received antibiotics, with minor neurological improvement initially, but she soon died because of a brain herniation. Based on our findings in this case, we discuss the features of endocarditis attributable to S. lugdunensis.