Key result
Anticoagulation and high-dose steroids fail to prevent embolic infarcts in Loeffler endomyocarditis.
Why the study?
Clonal, potentially therapy-related eosinophilia is an under-recognized cause of Loeffler's endomyocarditis requiring early diagnosis to prevent fibrosis and embolic complications.
Case Report (n=1)
Clonal, potentially therapy-related eosinophilia is an under-recognized cause of Loeffler's endomyocarditis that requires early diagnosis to prevent irreversible fibrosis and embolic complications.
Embolic infarcts persisted despite anticoagulation and steroids in Loeffler's endomyocarditis; hypothesis-generating for early clonal eosinophilia diagnosis.
BACKGROUND: Loeffler's endomyocarditis is a severe manifestation of hypereosinophilia characterized by eosinophil-mediated myocardial injury, mural thrombus formation, and endomyocardial fibrosis. While often idiopathic, it may arise from clonal eosinophilic disorders carrying higher risk of end-organ damage. CASE SUMMARY: /L) with cytopenias prompted a bone marrow biopsy, which revealed chronic eosinophilic leukemia with monosomy 7 and pathogenic mutations, raising concern for a therapy-related clonal process. Despite emergent systemic anticoagulation followed by high-dose corticosteroids, brain magnetic resonance imaging showed multifocal embolic infarcts. DISCUSSION: This case highlights clonal, potentially therapy-related eosinophilia as an under-recognized cause of Loeffler's endomyocarditis, requiring early diagnosis to prevent irreversible fibrosis and embolic complications.
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Ramesh et al. (2026) conducted a case report in Loeffler's endomyocarditis and chronic eosinophilic leukemia (n=1). Systemic anticoagulation and high-dose corticosteroids was evaluated. A patient with chronic eosinophilic leukemia developed Loeffler's endomyocarditis and multifocal embolic infarcts despite emergent systemic anticoagulation and high-dose corticosteroids.
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