“Crazy paving” on CT images refers to the superimposition of ground-glass opacity and linear pattern resembling irregularly shaped paving stones. Initially, “crazy paving” was described as a pathognomonic sign of alveolar proteinosis. Subsequently, this pattern has been reported in a variety of disorders of the lung. We demonstrated CT images of lung adenocarcinoma demonstrating both solid and crazy-paving appearances.

1. Ariozzi I, Paladini I, Gnetti L, et al. Computed tomography–histologic correlations in lung cancer. Pathologica. 2013;105:329–336.