PULMONARY EMBOLISM, X_RAY. PULMONARY EMBOLISM, X_RAY Pulmonary embolism. Thoracic x_ray in front view Pulmonary embolism is the brutal obstruction by the thrombus of the pulmonary artery or one of its branches. The thrombus most often arises from a deep vein of the limbs or the pelvis deep vein thrombosis. Deep vein thrombosis is the formation of thrombus at the level of the leg deep veins. It is more frequent among persons who remain sitted long hours at work. It is also the pathology of the ec