Abstract Antiphospholipid syndrome (APS) is an autoimmune disorder characterized by the presence of antiphospholipid antibodies and clinical manifestations, including thrombosis and pregnancy-related complications. While cardiac manifestations such as intracardiac thrombi, valvular disease, and intracardiac masses have been reported, the presentation of an intracardiac mass as the initial manifestation of primary APS (PAPS) is relatively uncommon. This case report describes a 40-year-old female patient who presented with an echogenic mass in the right ventricular outflow tract, subsequently diagnosed as a calcified amorphous tumor. Further investigation revealed elevated levels of anticardiolipin antibodies and beta-2 glycoprotein leading to the diagnosis of PAPS. The patient later developed digital ischemia, strengthening the suspicion of PAPS. This case highlights the importance of considering APS as a potential underlying cause for intracardiac masses, even in the absence of other typical manifestations. Early recognition and appropriate management, including anticoagulation and immunosuppressive therapy, are crucial to prevent further thrombotic complications and improve patient outcomes.
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