Pulmonary embolism (PE) is associated with high mortality. The worry about missing a PE diagnosis with the easy availability of D-dimer testing and computed tomography pulmonary angiography (CTPA) has led to a larger number of PE diagnoses being made. These include an increasing number of ‘incidental’ and ‘sub-segmental’ PE. Incidental PE is defined as PE identified on radiological imaging performed for indications other than for the identification of thromboembolism while sub-segmental PE is the presence of filling defects in the smaller branches of the pulmonary vasculature; the sub-segmental vessels.1,2 What is not yet clear is how to manage the patients with an incidental or sub-segmental PE?

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The probability of finding a PE, when the CT scans were performed for different reasons is more...

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