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She did not have a fever, expectoration, or any accompanying symptoms. She has a history of right leg deep vein thrombosis that occurred
5 years ago. Some time later, she dies of severe respiratory distress. A pulmonary autopsy specimen reveals red loose mass that is lodged
in the bifurcation of the pulmonary trunk with extensions into both the left and right main pulmonary arteries. Which of the following is
the most likely diagnosis?