ArticleJACC. Case reports2026
Loeffler Endocarditis: Multimodality Imaging of a Common Cardiac Phenotype in Distinct Hypereosinophilic Syndromes.
Article in JACC. Case reports, 2026. 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
backgroundLoeffler endocarditis is a late manifestation of hypereosinophilic syndromes characterized by endomyocardial fibrosis and intracardiac thrombosis. Early recognition is essential yet challenging because presentation is often nonspecific. CASE SUMMARY: Case 1 involved a 43-year-old man with long-standing atopy and persistent eosinophilia who presented with heart failure symptoms. Echocardiography demonstrated biventricular apical thrombi, and cardiac magnetic resonance confirmed ventricular thrombi and revealed diffuse subendocardial late gadolinium enhancement confirming fibrotic-stage disease. High-dose corticosteroids produced rapid hematologic response, and anticoagulation was initiated. Case 2 involved a 38-year-old man who was admitted for abdominal pain and incidentally found to have eosinophilia and right ventricular apical infiltration. Cardiac magnetic resonance established the diagnosis of Loeffler endocarditis. Molecular testing identified FIP1L1-PDGFRA-positive myeloproliferative hypereosinophilic syndrome. Eosinophil counts normalized promptly with imatinib.
conclusionsThese cases illustrate a final common cardiac phenotype arising from diverse causes of hypereosinophilia. Imaging was central not only for diagnosis and staging, but also for prompting systemic investigation and directing targeted therapy.
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