RESUMO
Cardiac tumors (CTs) and intracardiac masses are rare, with an incidence of 1 per 2 million people annually. We present a case of an intracardiac mass where the patient exhibited progressive lower extremity swelling, night sweats, and diarrhea. Computed tomography of the chest with intravenous contrast revealed a sizable intracardiac mass with mixed attenuation and signs of metastatic lesions, suggesting a malignant process. This case stands out due to its uncommon presentation, considerable size, and extension from the right atrium into the right ventricle and the inferior vena cava. Although the exact etiology remains unclear because of the absence of a biopsy, it was presumed to be a type of sarcoma. Owing to significant cardiac obstruction, the patient's condition worsened rapidly, culminating in a fatal outcome mere days after the initial presentation. While there are multiple approaches to identify and treat CTs, their propensity to grow quietly until they reach a size large enough to cause fatal symptoms restricts opportunities for early detection and treatment.