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1
Department of Radiology, Royal Brompton Hospital, Sydney St., London SW3 6NP,
United Kingdom.
2
Department of Paediatrics, St. Mary's Hospital, Praed St., London W2 1NY,
United Kingdom.
3
Department of Histopathology, Royal Brompton Hospital, London SW3 6NP, United
Kingdom.
4
Department of Paediatrics, Royal Brompton Hospital, London SW3 6NP, United
Kingdom.
OBJECTIVE. We assessed the accuracy of thin-section CT and chest radiography to diagnose pediatric interstitial lung disease.
MATERIALS AND METHODS. We identified 20 infants, boys, and girls (age range, 1 month to 14 years) with histopathologic confirmation of interstitial lung disease. Six boys and girls without interstitial lung disease were also included. Two observers independently assessed chest radiograph and CT images. The observers stated the most likely diagnosis and a differential diagnosis. We evaluated individual CT features and their distribution.
RESULTS. Observers' diagnoses on CT images were correct (first choice or differential) in 66% of observations versus 45% on chest radiographs (p < 0.025). Correct diagnoses were made on first choice in 61% of CT observations versus 34% on chest radiographs (p < 0.005). Observers were confident (versus uncertain) in 42% of the CT observations versus 18% on chest radiographs; of the confident diagnoses made on CT, 91% were correct. CT interpretations were most accurate in the diagnosis of pulmonary alveolar proteinosis, congenital lymphangiectasia, and idiopathic pulmonary hemosiderosis. All healthy patients examined with CT were correctly identified as such. We noted a distinctive CT pattern in three patients with nonspecific interstitial pneumonitis and one patient with desquamative interstitial pneumonitis; the CT pattern consisted of upper zone predominant honeycombing on a background of ground-glass attenuation.
CONCLUSION. A higher proportion of pediatric interstitial lung diseases can be diagnosed on thin-section CT than on chest radiographs. In our study, confident and correct diagnoses were made more frequently with CT than with chest radiographs.
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