A 71-year-old man presented with complaints of increasing dyspnea on exertion to his family physician. Pulmonary embolism was suspected because 6 months previously the patient underwent bilateral knee arthroplasty. CT angiography of the thorax was performed revealing bilateral filling defects in the main pulmonary arteries (Fig 1
). The patient was anticoagulated with heparin, transitioned to warfarin, and was subsequently discharged.