<unk>  <unk>  is the acute obstruction of the<unk>  artery or one of its branches by a thrombus, air, tumor, or fat.  Most often,<unk>  is due to a venous thrombus which has been dislodged from its site of formation in the deep veins of the lower extremities, a process referred to as venous thromboembolism. <unk>  is a potentially lethal condition.  The patient can present with a range of signs and symptoms; however, the typical presentation is characterized by dyspnea (78-81% of the cases), pleuritic chest pain (39-56% of the cases), and/or syncope (22-26% of the cases).  The diagnostic approach of<unk>  depends on whether the patient is a high-risk patient due to the presence of hypotension and/or shock or a non-high risk patient, as well as on the pre-test probability of this disease.  While fibrinolytic therapy is the treatment of choice for patients with massive<unk> , patients with non-massive<unk>  are treated with anticoagulation therapy.
Pulmonary embolism
Pulmonary hemorrhage
Pleural effusion
Lung infarction
Pulmonary aspiration
Air embolism
Aspiration pneumonia
Pleurisy