Crazy paving

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Crazy paving refers to the appearance of ground-glass ~~opacity~~opacities with superimposed interlobular septal thickening and intralobular septal thickening, seen on chest HRCT or standard CT chest. It is a non-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: ARDS of unknown aetiology
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
- Goodpasture syndrome
chronic eosinophilic pneumonia
usual interstitial pneumonia (UIP) with superimposed diffuse alveolar damage
pulmonary oedema
pulmonary infections
cryptogenic organising pneumonia (COP, formerly BOOP)
invasive mucinous adenocarcinoma of the lung (formerly mucinous bronchoalveolar 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-3">ground-glass opacity</a> with superimposed <a href="/articles/interlobular-septal-thickening">interlobular septal thickening</a> and <a href="/articles/intralobular-septal-thickening">intralobular septal thickening</a>, seen on <a href="/articles/high-resolution-ct-1">chest HRCT</a>. 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>
+<p><strong>Crazy paving</strong> refers to the appearance of <a href="/articles/ground-glass-opacification-3">ground-glass opacities</a> with superimposed <a href="/articles/interlobular-septal-thickening">interlobular septal thickening</a> and <a href="/articles/intralobular-septal-thickening">intralobular septal thickening</a>, seen on <a href="/articles/high-resolution-ct-1">chest HRCT</a> or standard CT chest. 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>

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Crazy paving

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