PMID- 37692703 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230913 IS - 2168-8184 (Print) IS - 2168-8184 (Electronic) IS - 2168-8184 (Linking) VI - 15 IP - 8 DP - 2023 Aug TI - FIP1L1-PDGFRA Clonal Hypereosinophilic Syndrome With Eosinophilic Myocarditis and Intracardiac Thrombus. PG - e43138 LID - 10.7759/cureus.43138 [doi] LID - e43138 AB - A 45-year-old man from El Salvador with no past medical history presented with cough and chest pain. Investigations revealed 60% peripheral eosinophilia (absolute count 12.3 K/uL). Cardiac imaging was consistent with myocarditis with intracardiac thrombus formation. Endomyocardial biopsy confirmed eosinophilic infiltration of the myocardium, and bone marrow biopsy showed hypercellular marrow with 28% eosinophils. Cytogenetics/fluorescence in situ hybridization (FISH) confirmed positive FIP1L1-PDGFRA rearrangement. The patient was treated for FIP1L1-PDGFRA clonal hypereosinophilic syndrome with associated eosinophilic myocarditis and intracardiac thrombus. The treatment regimen consisted of a steroid taper, imatinib, and anticoagulation. Treatment was followed by normalization of the eosinophil count. At two-year follow-up, the patient was without recurrence of eosinophilia on maintenance imatinib and indefinite anticoagulation with warfarin. CI - Copyright (c) 2023, Locke et al. FAU - Locke, Margaret AU - Locke M AD - Internal Medicine, Zucker School of Medicine, Hempstead, USA. FAU - Suen, Rachel M AU - Suen RM AD - Internal Medicine, Mayo Clinic, Rochester, USA. FAU - Williamson, Alex K AU - Williamson AK AD - Pathology, Zucker School of Medicine, Hempstead, USA. FAU - Nieto, Maria J AU - Nieto MJ AD - Hematology, Zucker School of Medicine, Hempstead, USA. LA - eng PT - Case Reports DEP - 20230808 PL - United States TA - Cureus JT - Cureus JID - 101596737 PMC - PMC10484160 OTO - NOTNLM OT - clonal hypereosinophilic syndrome OT - eosinophilic leukemia OT - eosinophilic myocarditis OT - hypereosinophilic syndrome OT - intracardiac thrombus COIS- The authors have declared that no competing interests exist. EDAT- 2023/09/11 06:42 MHDA- 2023/09/11 06:43 PMCR- 2023/08/08 CRDT- 2023/09/11 04:41 PHST- 2023/08/07 00:00 [accepted] PHST- 2023/09/11 06:43 [medline] PHST- 2023/09/11 06:42 [pubmed] PHST- 2023/09/11 04:41 [entrez] PHST- 2023/08/08 00:00 [pmc-release] AID - 10.7759/cureus.43138 [doi] PST - epublish SO - Cureus. 2023 Aug 8;15(8):e43138. doi: 10.7759/cureus.43138. eCollection 2023 Aug.