Crazy paving
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Crazy paving refers to the appearance of ground-glass opacity with superimposed interlobular septal thickening and intralobular reticular thickening, seen on chest HRCT. It is a nonspecificnon-specific finding that can be seen in a number of conditions.
Pathology
Aetiology
Common causes:
- acute respiratory distress syndrome (ARDS)
- bacterial pneumonia
-
acute interstitial pneumonia:
essentiallyARDS of unknownetiologyaetiology - pulmonary alveolar proteinosis (PAP): rare, but the great majority of patients with PAP demonstrate crazy paving
Less common causes:
- drug-induced pneumonitis
- radiation pneumonitis
- pulmonary haemorrhage / diffuse pulmonary haemorrhage
- chronic eosinophilic pneumonia
- usual interstitial pneumonia (UIP) with superimposed diffuse alveolar damage
- pulmonary oedema
- pulmonary infections
- cryptogenic organizing pneumonia (COP, formerly BOOP)
- mucinous bronchioloalveolar carcinoma
- sarcoidosis, especially alveolar sarcoidosis
- lipoid pneumonia
- pulmonary veno-occlusive disease
-<p><strong>Crazy paving</strong> refers to the appearance of <a href="/articles/ground-glass-opacification">ground-glass opacity</a> with superimposed <a href="/articles/interlobular-septal-thickening">interlobular septal thickening</a> and intralobular reticular thickening, seen on chest HRCT. It is a nonspecific finding that can be seen in a number of conditions. </p><h4>Pathology</h4><h5>Aetiology</h5><p>Common causes:</p><ul>- +<p><strong>Crazy paving</strong> refers to the appearance of <a href="/articles/ground-glass-opacification-1">ground-glass opacity</a> with superimposed <a href="/articles/interlobular-septal-thickening">interlobular septal thickening</a> and intralobular reticular thickening, seen on chest HRCT. It is a non-specific finding that can be seen in a number of conditions. </p><h4>Pathology</h4><h5>Aetiology</h5><p>Common causes:</p><ul>
-<a href="/articles/acute-interstitial-pneumonia">acute interstitial pneumonia</a>: essentially ARDS of unknown etiology</li>- +<a href="/articles/acute-interstitial-pneumonia">acute interstitial pneumonia</a>: ARDS of unknown aetiology</li>