RESUMEN
Intracardiac masses have several etiologies: tumor, infectious, thrombotic. They constitute a diagnostic challenge for the clinician. Behçet's disease is a chronic multisystemic vasculitis evolving by relapses. Intracadiac thrombosis in this disease deserves special attention because of its life-threatening nature. They often appear in the early stages of the disease, and the most frequent location is the right heart chambers. We present the case of a 23-year-old patient with an isolated mass in the right ventricle revealing an initial manifestation of Behçet's disease. The presented clinical case highlights the importance of early recognition of Behçet's disease, as well as the awareness of including this disease in the differential diagnosis of intracardiac masses in young adults.