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Funding Acknowledgements Type of funding sources: None. Background Papillary fibroelastoma (PFE) is now regarded as the most common primary tumor of the heart. Although benign, they are clinically significant for their high risk of embolization. They are most commonly found on cardiac valves but can also be present on non-valvular endocardial surfaces. The aim of this study was to better characterize patients with left-sided non-valvular PFE and its clinical sequelae. Methods We retrospectively identified patients with pathology-proven PFEs at a single center between January 1995 and December 2018 (n = 279). Patients with left-sided non-valvular PFE were analyzed. Medical records were retrospectively reviewed for clinical characteristics and outcomes. In addition, intra-operative transesophageal echocardiograms were manually reviewed to estimate overall size and location. Results During the study period, we identified 37 patients with left-sided non-valvular PFE (mean age 61 ± 14 years; 62% females) (Table). PFEs were located on the left ventricle in 41%, left atrium in 35%, and left ventricular outflow tract in 24% of patients. Around a quarter of patients (27%) had a diagnosis of hypertrophic cardiomyopathy, 19% had prior cardiac surgery, and 27% had cancer diagnosed prior to PFE diagnosis. Transient ischemic attack or stroke was the presenting symptom in 22% of patients, myocardial infarction in 6% and peripheral embolization in 6%. Median maximal length for PFE on the left ventricle was 11.1 mm [3;18], on the left atrium 9 mm [2;25], and left ventricular outflow tract 8 mm [6;13]. A minority of patients (9/37 [24%]) had associated valvular PFE on the mitral valve and/or aortic valve (1 patient had both mitral valve and aortic valve PFE, 7 had aortic valve PFE and 1 had Mitral valve PFE). Only 13 patients had follow up transthoracic/transesophageal echocardiogram 1 year after PFE removal; 4/13 (31%) had documented PFE recurrence (3 PFE recurred in the same location as the original; 1 in a different location). Conclusion Left-sided non-valvular PFE is associated with thromboembolic events and at least in those that had follow-up echocardiograms, had a high recurrence rate. More studies are needed to evaluate the management of patients with asymptomatic PFE. Abstract Figure. Baseline Characteristics

Clinical and echocardiographic characteristics of patients with pathology proven left-sided non-valvular papillary fibroelastoma