Bronchioloalveolar carcinoma (BAC) has been classified into mucinous and non-mucinous subgroups and is characterised by a lepidic growth pattern through the airways and air spaces with preservation of the lung architecture. BAC may present with a variety of CT appearances. Features of BAC are the CT angiogram sign or air bronchograms in solitary nodules and in the periphery of larger consolidations, unifocal or multifocal ground-glass opacities, the crazy-paving pattern, and lobar or multilobar consolidation and cavitating nodules [31] . In patients with a crazy-paving pattern, the ground-glass attenuation reflects the lowdensity intra-alveolar material (glycoprotein), whereas the superimposed lines are due to infiltration of the interstitium by inflammatory or tumour cells [32] .