Crazy paving
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Crazy paving refers to the appearance of ground-glass opacity with superimposed interlobular septal thickening and intralobular septal thickening, seen on chest HRCT. 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
- chronic eosinophilic pneumonia
- usual interstitial pneumonia (UIP) with superimposed diffuse alveolar damage
- pulmonary oedema
- pulmonary infections
- cryptogenic organising 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-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">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>-<li>-<a href="/articles/acute-respiratory-distress-syndrome-1">acute respiratory distress syndrome</a> (ARDS)</li>- +<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>
- +<li><a title="Acute respiratory distress syndrome" href="/articles/acute-respiratory-distress-syndrome-1">acute respiratory distress syndrome (ARDS)</a></li>
-<a href="/articles/usual-interstitial-pneumonia">usual interstitial pneumonia</a> (UIP) with superimposed diffuse alveolar damage</li>- +<a title="Usual interstitial pneumonia (UIP)" href="/articles/usual-interstitial-pneumonia">usual interstitial pneumonia (UIP)</a> with superimposed <a title="Diffuse alveolar damage" href="/articles/diffuse-alveolar-damage">diffuse alveolar damage</a>
- +</li>
-<li><a title="Pneumocystis jirovecii pneumonia" href="/articles/pneumocystis-pneumonia"><em>Pneumocystis jirovecii</em> pneumonia (PCP)</a></li>- +<li><a href="/articles/pulmonary-pneumocystis-jiroveci-infection"><em>Pneumocystis jirovecii</em> pneumonia (PCP)</a></li>
- +<li><a title="COVID-19" href="/articles/covid-19">COVID-19</a></li>