Keyla Patrícia Barbosa Melo et al. Rafael José Coelho Maia Betty Janny Maia Siqueira Mozart Lacerda Siqueira Campos Araújo Ana Carolina Borges de Miranda Souza
Primary mediastinal sarcoma is rare, corresponding to less than 1% of all soft tissue sarcomas and less than 10% of all primary mediastinal tumors.
A 52-year-old man with signs and symptoms of cardiac tamponade underwent echocardiography of the right ventricle, which revealed significant pericardial effusion and an extensive heterogeneous mediastinal mass measuring approximately 15 × 8 cm in the pericardial space in close contact with the right chambers and causing diastolic collapse. The diagnostic hypothesis was a pericardial or mediastinal neoplastic process invading the pericardium. Subsequently, an immunohistochemical study confirmed a high-grade fusiform/pleomorphic cell sarcoma.
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