Papillary fibroelastoma is a relatively rare cardiac tumor, which etiology is undisclosed and not entirely clear. A relatively small number of case descriptions and investigations makes it difficult to accumulate the material, which is absolutely necessary in view of the diversity and ambivalence of the tactics of the management of the different groups of patients. The article represents the case reports of the papillary fibroelastoma of the left coronary leaflet of the aortic valve in a 79 y.o. man and 15 y.o. woman. In both cases patients hadn't any complains; both fibroelastomas were accidentally detected. Due to echocardiography and CMR, it was succeed to obtain data on the hemodynamic significance of these tumors, to reveal their precize localization and to assess their mobility, also to differentiate them with other masses.