Abstract

Bronchioloalveolar carcinoma (BAC), a subtype of adenocarcinoma, forms 2.6-4.3% of all lung cancers. BAC shows pure lepidic growth without invasion of stroma, blood vessels or pleura. BAC mostly appears as a peripheral pulmonary nodule; however, the tumor may sometimes present as a segmental, lobar consolidation, and have a multifocal or diffuse pattern. An unusual form of BAC is presented which has well defined, scattered, and sometimes united nodules throughout the lungs.