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(Radiology. 1999;211:155-160.)
© RSNA, 1999


Thoracic Imaging

Crazy-paving Appearance at Thin-Section CT: Spectrum of Disease and Pathologic Findings1

Takeshi Johkoh, MD, Harumi Itoh, MD, Nestor L. Müller, MD, PhD, Kazuya Ichikado, MD, Hironobu Nakamura, MD, Junpei Ikezoe, MD, Masanori Akira, MD and Tomofumi Nagareda, MD

1 From the Dept of Radiology, Osaka University Medical School, Japan (T.J., H.N.); Dept of Radiology, Vancouver Hospital and Health Sciences Centre and University of British Columbia, 855 W 12th Ave, Vancouver V5Z 1M9, Canada (T.J., N.L.M.); Dept of Radiology, Kyoto University Medical School, Japan (H.I.); First Dept of Internal Medicine, Kumamoto University School of Medicine, Japan (K.I.); Dept of Radiology, Ehime University Medical School, Japan (J.I.); Dept of Radiology, National Kinki Chuo Hospital for Chest Diseases, Osaka, Japan (M.A.); and Dept of Pathology, Izumisano Municipal Hospital, Osaka (T.N.). From the 1996 RSNA scientific assembly. Received Apr 2, 1998; revision requested Jun 29; final revision received Sep 8; accepted Oct 26. Address reprint requests to N.L.M.

PURPOSE: To determine the spectrum of diseases associated with a fine reticular pattern superimposed on areas of ground-glass opacity (ie, "crazy-paving" appearance) at thin-section computed tomography (CT) and to determine the underlying pathologic features.

MATERIALS AND METHODS: In the in vivo study, the cases of 46 patients (21 male, 25 female; age range, 13–82 years) were retrospectively reviewed, with special attention paid to the size and extent of the reticular network. In the in vitro study, the thin-section CT findings in 20 inflated and fixed lungs were precisely correlated with the gross appearance, contact radiograph findings, stereomicroscopic views, and histologic findings.

RESULTS: In the in vivo study, 15 different diseases were identified, including alveolar proteinosis, adult respiratory distress syndrome, acute interstitial pneumonia, diffuse alveolar damage superimposed on usual interstitial pneumonia, and drug-induced pneumonitis. In the in vitro study, the fine networks at pathologic analysis were due to an alveolar filling process (n = 10), an interstitial fibrotic process (n = 7), or a combination of interstitial and intraalveolar processes (n = 3). Twelve (60%) cases did not have thickening of the interlobular septa within the areas of the crazy-paving appearance.

CONCLUSION: The crazy-paving appearance is a nonspecific finding seen in a variety of interstitial and airspace lung diseases.

Index terms: Computed tomography (CT), comparative studies, 60.126, 60.1292, 68.11, 68.12118 • Computed tomography (CT), thin-section, 68.12118 • Lung, CT, 60.12118 • Lung, diseases, 60.2061, 60.2075, 60.213, 60.2173, 60.23, 60.4123, 60.413, 60.47, 60.632, 60.71 • Lung, infection, 60.20 • Pneumonia, acute interstitial, 60.213 • Proteinosis, pulmonary alveolar, 60.791 • Respiratory distress syndrome, adult, 60.413




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