Pulmonary embolism is a frequently observed clinical entity. Its mortality rate is about 10%. Most patients with pulmonary embolism have an inherited predisposition such as surgery, pregnancy, or adiposity. Further important risk factors are immobilization, malignancies or hormonal factors. The clinical presentation may vary considerably. Acute obstruction of the pulmonary arterial bed often results in right ventricular (RV) pressure overload detected by transthoracic echocardiography (TTE), usually defined as RV dysfunction, dilatation or hypokinesis. The presence of RV dilatation or hypokinesis inFigures 1 to 3. Pulmonary angiography demonstrating subtotal occlusion of the right and left pulmonary artery with diffuse leaks of the contrast flow around the thrombus. 1 2 3 Figures 4 to 6. Picture in picture: under angiographic control, we pulled the IVUS catheter slowly back out of the pulmonary artery and were able to make a direct intravascular ultrasound with visualization and quantification of the thromboembolus. The angiography finds marginal flow of the contrast medium around the thrombus.4 5 6 366