A 90-year-old woman is brought to the closest emergency room after being found in a confusional state of mind, with lateral-sided sight deviation with normal cardiovascular findings. Her past medical history is characterized by the presence of systemic hypertension, moderate-to-severe chronic disease. The 12-lead electrocardiogram showed sinus rhythm and aspecific anomalies of the left ventricular repolarization. Lab tests showed normal white blood cells count with increased creatinine levels and quite normal flogosis indices. An initial transthoracic echocardiogram (TTE) showed mild left ventricular concentric hypertrophy with preserved systolic function, but also revealed the presence of a moving posterior mitral leaflet mass, determining mild mitral regurgitation. A head CT scan was performed, showing a right temporo-insular ischemic ipodensity. Considering the echocardiographic and neuronal findings, a transesophageal echocardiogram (TEE) was indicated to look for and better describe the suspicious mass, after beginning an antibiotic therapy in an empiric regimen. TEE revelead a multi-lobular mass characterized by inhomogeneous echogenicity, leaning on the annulus and the atrial side of the posterior mitral leaflet that was fissurated, leading to mild mitral regurgitation. The left appendage showed normal emptying velocity and absence of thrombi. It was not easy to describe this mass morphology and dimensions, but in some projections, it reminded us of a reindeer with various antlers. This case could resemble a classic mitral valve endocarditis, evolved into valve fissuration and arterial embolization leading to ischemic stroke, but the unusual fact is that the laboratory tests showed no white blood cells alteration during the whole hospitalization, with a really minimal CRP change and always negative procalcitonin. That is why we came into the idea that such a mass could also not represent a classical endocarditis. Considering that the echocardiographic characteristics of a thrombus were not encountered, the mass may be a tumor. The most frequent tumors involving the heart valves are papillary fibroelastomas. Considering the absence of clinic endocarditis, some hints led to consider this differential diagnosis: fibroelastomas mostly occur during older ages, they frequently have a mitral or aortic location and they can embolize, differently from vegetations, they are located mostly on the annulus and the basal posterior mitral leaflet.