Pulmonary artery sarcomas are exceptionally rare, and they are often misdiagnosed as chronic pulmonary thromboemboli. Early and accurate diagnosis is crucial to the prognosis of patients who have pulmonary artery sarcomas.Herein, we describe the case of a 74-year-old man who presented with dyspnea and was initially thought to have a pulmonary embolus. Anticoagulation with unfractionated heparin was ineffective. Rare angiographic findings during routine cardiac catheterization led to the diagnosis of a high-grade, nonmyogenic, primary pulmonary artery sarcoma. This case illustrates the usefulness of angiographic findings as an adjunct to conventional diagnostic methods in correctly identifying this rare, aggressive malignancy.
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