This is a description of subsolid nodules, what they are and why we treat them differently from solid nodules. Here are some of the references I used in this article: The revised lung adenocarcinoma classification—an imaging guide https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4209391/ CT screening for lung cancer: frequency and significance of part-solid and nonsolid nodules https://www.ajronline.org/doi/full/10.2214/ajr.178.5.1781053 Guidelines for Management of Incidental Pulmonary Nodules Detected on CT Images: From the Fleischner Society 2017 https://pubs.rsna.org/doi/10.1148/radiol.2017161659 LungRADS 1.1 https://www.acr.org/-/media/ACR/Files/RADS/Lung-RADS/LungRADSAssessmentCategoriesv1-1.pdf=la=en