The mass that should not be there: multi-modality imaging clarifies a diagnostic conundrum

We report a case of a 77-year-old male with an incidental finding of a filling defect in his main pulmonary artery on computed tomography. Pulmonary embolism was initially suspected however through serial multimodality imaging the diagnosis became a main pulmonary artery fibroelastoma, a very rare site for this tumour. The case highlights the importance of marrying radiological findings with clinical examination and demonstrates how complementary information was gained by each modality. Furthermore, the case demonstrates how monitoring a lesion’s behaviour over time can influence the differential diagnosis from a common to a much rarer pathology.