47The Crazy-Paving Pattern

The crazy-paving pattern is a common finding at thin-section computed tomography (CT) of the lungs. It consists of scattered or diffuse ground-glass attenuation with superimposed interlobular septal thickening and intralobular lines; this finding has a variety of causes. Table 47.1 details the features of some of the more common conditions associated with the crazy-paving pattern.

Differential Diagnoses Related to Crazy-Paving Pattern on CT

Infectious Disease

• Pneumocystis carinii pneumonia (PCP)
• Bacterial pneumonia
• Tuberculosis
• Mycoplasma pneumonia
• Chronic eosinophilic pneumonia

Neoplastic Disease

• Mucinous bronchioloalveolar carcinoma (BAC)

Idiopathic Disease

• Pulmonary alveolar proteinosis (PAP)
• Sarcoidosis
• Nonspecific interstitial pneumonia (NSIP)
• Organizing pneumonia

Disease Caused by Inhalation

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