A Case of Cardiobacterium hominis Endocarditis Manifesting as Isolated Renal Infarction: Clinical Insights and Novel Presentation.

A 47-year-old woman presented with renal infarction due to an unknown etiology. Intravascular ultrasonography (IVUS) revealed emboli rather than dissection, guiding successful renal artery intervention that resolved her abdominal pain and preserved renal function. Blood culture revealed Cardiobacterium hominis, and echocardiography confirmed infective endocarditis with vegetation on the mitral valve. Antimicrobial therapy effectively controlled the infection without worsening mitral regurgitation or embolism. This case highlights the role of IVUS in differentiating emboli from dissection, demonstrating the benefits of revascularization in renal infarction and representing a rare instance of renal infarction solely caused by C. hominis.