[Subsolid pulmonary nodules]

Subsolid nodules represent almost 20% of all pulmonary nodules found incidentally at chest computed tomography (CT). Their detection is steadily rising, in parallel with the increasing number of CT scans performed. Subsolid nodules differ from solid lung nodules in several ways: morphology, course of progression, risk of malignancy and prognosis. Although they remain a diagnostic challenge, a good correlation has been established between radiological appearance and histopathology. Whilst 75% of persistent subsolid nodules represent a form of adenocarcinoma, their prognosis is generally excellent when resected. Non-resected subsolid nodules require a long follow-up of 3 to 5 years due to their slow-growing nature and high prevalence of malignancy. Specific guidelines have been published in 2013 and in 2015.