ArticleJournal of medical case reports2025
Mycotic cerebral aneurysm secondary to Streptococcus parasanguinis infective endocarditis: a case report.
Article in Journal of medical case reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe pathogenesis of infective endocarditis can cause a range of extracardiac complications. Delayed diagnosis may result in catastrophic embolic sequelae. Streptococcus parasanguinis is a pathogen that insidiously causes infective endocarditis and has rarely been associated with intracerebral mycotic aneurysms in contemporary medical literature.
objectiveThe objective of this cae report is to describe the presentation, investigation, and management of a peculiar case of S. parasanguinis-associated infective endocarditis causing a mycotic cerebral aneurysm. CASE PRESENTATION: We report our experience in treating a 70-year-old New Zealand European male patient who presented with a left parietal lobe hemorrhage. He was subsequently found to have a mycotic cerebral aneurysm. The patient had underlying S. parasanguinis infective endocarditis. This patient was treated neurosurgically for the mycotic aneurysm with subsequent surgical valve replacement. We discuss relevant considerations of treating these pathologies. We discuss the clinical features, cardioradiology and neuroradiology of this obscure but important disease process.
conclusionS. parasanguinis, a viridans group Streptococcus, is an important cause of infective endocarditis but is rarely associated with cerebral mycotic aneurysms. It often causes a subacute form of infective endocarditis, which can hinder initial diagnostic clarity. When embolic phenomena cause the formation of an intracerebral aneurysm, the specific neuroradiological findings of intracerebral mycotic aneurysms should raise the clinician's suspicion of underlying infective endocarditis. Infective endocarditis becomes significantly more common as people age. Thus, the holistic and objective clinician must maintain a broad differential and investigate widely until a definitive etiology is elucidated. Early recognition is key to favorable outcomes. Management of similar cases requires a multidisciplinary approach with both physicians and surgeons working to identify pathology and provide treatment in a logical sequence.
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