Abstract : During the follow-up of oncologic patients, pulmonary nodules are frequently discovered and pose a challenge to radiologists. Eventhough metastatic origin is often proposed, a thorough imaging protocol including non- and contrast-enhanced computed tomography combined with advanced reconstruction techniques, can be of a great support in proposing alternative diagnosis and adequate complementary treatment. This statement is illustrated by the case of a 60-year-old patient in which a pulmonary nodule diagnosed first as a metastasis, proved to be an aneurysmal pulmonary formation.