Pulmonary embolism (the blockage of a pulmonary artery by a blood clot) is the third cause of cardiovascular death in Europe. Upon diagnosis confirmation, clinicians evaluate the patient prognosis based on risk stratification models. The management of patient, thus its outcome, highly depend on this risk stratification. Recent studies confirmed that patient stratification based on computed tomography pulmonary angiogram (CTPA) are not well correlated to patient prognosis.