Pulmonary thromboembolism is a frequent complication of cancer; in some cases, it is diagnosed occasionally during diagnostic examinations as part of the regular follow-up of the disease. Not all patients diagnosed with thromboembolism present symptoms; therefore, after appropriate investigations during observation in the emergency room and/or a short hospitalisation in Emergency Medicine, they could be discharged home, avoiding lengthy hospitalisations that would have a considerable impact on their health and psychological condition. The goal of this observational study is to compare the efficacy of several assessment scales for use by physicians to identify patients at low risk of developing serious complications of pulmonary embolism within 30 days of diagnosis, in order to be able to identify a group of low-risk patients who could be discharged early from the emergency department/emergency medicine safely. What does participation in this study entail compared to the normal care you receive and what are your responsibilities as a participant? At the time of patient enrolment in the emergency room/emergency medicine, the data necessary for the calculation of 6 scoring systems will be collected, which will take approximately 5 minutes. The patient enrolled in the study will be contacted by telephone in order to assess the state of health; the call will take approximately 1 minute and will take place 30 days after access to the emergency room. Participation in the study does not entail any obligation or restriction, nor will it be charged for.