Primary cardiac tumors are a rare entity. The presence of a mass in the left atrium suggests myxoma as a first differential diagnosis. Here we present a rare case of a woman with exertional dyspnea with a large tumor in the left atrium. The patient was extensively studied with echocardiography, cardiac MRI, coronary angiography and computed tomography. Extracardiac neoplastic involvement was ruled out. The patient underwent surgery, the mass was removed, and the final diagnosis was an undifferentiated pleomorphic sarcoma.

Background: The occurrence of pulmonary artery obstruction in the course of acute aortic dissection is an unusual complication. The mechanism implicated is the rupture of the outer layer of the aorta and the subsequent hemorrhage into the adventitia of the pulmonary artery that causes its wall thickening and, at times, produces extrinsic obstruction of the vessel. There are no reports of this complication in acute intramural hematoma.

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