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Introduction: The aim of this study was to survey the attitudes of internists, cardiologists, and pulmonologists regarding treatment or no treatment of isolated subsegmental pulmonary embolism (ISSPE) with anticoagulant drugs., Methods: Qualified physicians were asked to select their management options from a questionnaire that included a patient scenario with subsegmental pulmonary embolism (SSPE) and negative past medical history of thromboembolism., Results: A total of 113 physicians responded to the survey. Of these, 8.8% preferred not to treat patients without further evaluation; 15% decided not to treat, but follow-up the patient with a serial lower-limb colour Doppler ultrasonography; 1.7% preferred anticoagulant treatment only during hospitalization and follow-up without medication; 5% preferred anticoagulant treatment for less than 3 months; and 34.5% chose a 3-6-month treatment with anticoagulation. Furthermore, 24% of physicians opted for anticoagulant treatment for more than 6 months, and 9.7% left the decision up to the patient. Opting not to treat was an option selected by more board-certified faculty members specialized in cardiology, internal medicine, and pulmonology compared with residents ( p = 0.038). Willingness to provide anticoagulant therapy in the internal medicine, cardiology and pulmonology groups was 56.6%, 37.3% and 6%, respectively ( p = 0.007)., Conclusion: The majority of physicians surveyed prefer anticoagulant therapy in patients with SSPE., Competing Interests: The authors declare they have no conflict of interest.