"Crazy paving appearance" on high resolution CT in various diseases.
OBJECTIVE
The purpose of this work was to demonstrate the variety of causes of crazy-paving appearance (CPA) on high resolution CT (HRCT).


METHODS
To identify cases exhibiting CPA (ground-glass opacity with superimposed interlobular septal thickening and intralobular interstitial thickening) on HRCT, we prospectively searched for them over a period of 29 months.


RESULTS
We identified 10 cases of CPA on HRCT, including 4 Pneumocystis carinii pneumonia, 1 alveolar proteinosis, 1 usual interstitial pneumonia, 1 pulmonary hemorrhage, 1 acute radiation pneumonitis, 1 adult respiratory distress syndrome, and 1 drug-induced pneumonitis.


CONCLUSIONS
CPA can result from a variety of diseases. When we encounter CPA on HRCT, clinical information is necessary for differentiation of these entities.
Murayama
S
S
Department of Radiology, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Murakami
J
J
Yabuuchi
H
H
Soeda
H
H
Masuda
K
K
D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006470:Hemorrhage / Q000000981:diagnostic imaging; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008171:Lung Diseases / Q000000981:diagnostic imaging*; D017563:Lung Diseases, Interstitial / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011020:Pneumonia, Pneumocystis / Q000000981:diagnostic imaging; D011446:Prospective Studies; D011649:Pulmonary Alveolar Proteinosis / Q000000981:diagnostic imaging; D017564:Radiation Pneumonitis / Q000000981:diagnostic imaging; D012128:Respiratory Distress Syndrome / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*