["Crazy paving" of the lungs].

The term «crazy paving» describes an unspecific pattern in thoracic computed-tomography mimicking a paving stone configuration. This pattern can be caused by a number of differential diagnosis, for example alveolar hemorrhage, alveolar proteinosis, lipoid pneumonia or adenocarcinoma in situ. The knowledge of the correlation between imaging findings, histopathological pattern and clinical presentation prepares the clinician to understand the pathophysiology and to initiate the right therapeutic processes. In the following review, we describe the most common diseases and their radiologic correlation in daily practice.