Abstract
Behçet's Syndrome (BS) is a chronic vasculitis of unknown etiology. Arterial involvement occurring in the pulmonary artery is associated with poor prognosis. It may cause pulmonary thrombus (PTE) and aneurysm (PAA) which may also lead to a rare complication, intracardiac thrombus. PAA and PTE can be complications of BS and are associated with high morbidity and mortality. A 30-year-old male patient had a fever of 38.4°C, recurrent oral-genital ulcers, shortness of breath, cough, and sputum. In this case report, medical history, clinical and laboratory examinations, radiography, echocardiography, and computer tomography imaging examinations were performed. PAA, PTE, intracardiac and left popliteal vein thrombosis, and infective endocarditis were present. The patient was diagnosed with BS according to the International Study Group criteria. Surgery was performed for intracardiac thrombus. Vegetation within the thrombus was demonstrated histopathologically. The patient's clinical condition and laboratory tests improved with intervention and medical treatments. The patient with BS, PAA, PTE, intracardiac thrombus, and infective endocarditis was successfully treated with pulmonary embolization, antibiotics, and systemic immunosuppression, despite its rarity, poor prognosis, and high morbidity and mortality rates.