Computed tomographic (CT) pulmonary angiography is widely used for evaluation of pulmonary embolism. Intraluminal filling defects in the contrast enhanced pulmonary arteries are considered diagnostic of pulmonary emboli. We report a false-positive case where filling defects in the pulmonary artery were due to mixing of blood from a complex shunt or vascular malformation between the systemic arteries and pulmonary artery.
Keywords: CT pulmonary angiogram; pulmonary embolism; systemic-pulmonary artery shunt; tuberculosis.
© 2016 The Royal Australian and New Zealand College of Radiologists.