Elementary Lesions

Ground-glass opacity with crazy paving pattern

Characteristics

•  Combination of ground-glass opacity, thickened polygonal septal lines, and intralobular reticulation 

Diagnostic Orientation

• Ground-glass opacity with crazy paving pattern can be associated with various conditions:

  • pulmonary alveolar proteinosis ++

  • cardiogenic pulmonary oedema

  • invasive lepidic mucinous adenocarcinoma (previous denomination : bronchiolalveolar carcinoma (BAC))

  • infectious lung disease (pneumocystosis, virus)

  • drug-induced pneumonia

  • exogenous lipoid pneumonia

  • acute eosinophilic pneumonia

  • acute interstitial pneumonia

  • aspiration pneumonia

  • sarcoidosis

  • alveolar haemorrhage