<unk>  is classically associated with pulmonary alveolar proteinosis. The linear network or reticular pattern in the<unk>  is believed to result from a thickening of the interlobular septa, while areas of ground-glass opacity result from partial alveolar filling processes.
Crazy paving sign
Landolfi sign
Westermark sign
Fleischner sign
Quincke sign
Puddle sign
Duroziez sign
Cullen's sign