"In 2011, the International Association for the Study of Lung Cancer (IASLC), American Thoracic Society (ATS), and European Respiratory Society (ERS) 4 introduced a new classification and terminology for adenocarcinoma of the lung, which is now divided into 'preinvasive', 'minimally invasive', and 'invasive'."
"The term bronchoalveolar carcinoma (BAC) has been retired, and it is recommended that all invasive adenocarcinomas be classified in terms of the "predominant" histology 4. Both mucinous and non-mucinous adenocarcinomas typically consist of a mixture of histologic patterns, but reporting of the predominant subtype (lepidic, acinar, papillary, micropapillary, or solid growth) is specifically recommended for non-mucinous lesions, with all mucinous tumours placed in a separate category."