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Subpleural micronodules in diffuse infiltrative lung diseases: evaluation with thin-section CT scans.
M Remy-Jardin1, R Beuscart, M C Sault
1Department of Diagnostic Radiology, Hôpital Calmette, Lille, France.
Radiology
|October 1, 1990
Summary
Subpleural parenchymal micronodules are common in certain lung diseases like coal worker's pneumoconiosis and sarcoidosis. While not diagnostic alone, these CT findings can suggest specific diagnoses when present with other lung abnormalities.
Area of Science:
- Radiology
- Pulmonary Medicine
- Diagnostic Imaging
Background:
- Subpleural parenchymal micronodules are small (<7 mm) areas of increased attenuation visible on CT scans.
- Their frequency, distribution, and diagnostic significance in various infiltrative lung diseases require further elucidation.
Purpose of the Study:
- To evaluate the frequency, profusion, and diagnostic value of subpleural parenchymal micronodules in patients with infiltrative lung diseases.
- To compare the presence of these micronodules across different disease groups and healthy controls.
Main Methods:
- Thin-section computed tomography (CT) was performed on 244 patients with infiltrative lung diseases and 29 healthy controls.
- Patients were categorized into four groups: coal miners with and without pneumoconiosis, nonoccupational chronic infiltrative lung disease, and healthy adults.
Main Results:
- Subpleural parenchymal micronodules were frequently observed in pulmonary lymphangitic carcinomatosis, coal worker's pneumoconiosis, and sarcoidosis.
- These micronodules were also present in 14% of healthy control subjects, often in posterior upper lobe subpleural areas.
- Isolated micronodules lacked diagnostic value, but their presence with mild parenchymal lesions suggested pneumoconiosis, sarcoidosis, or lymphangitic carcinomatosis.
Conclusions:
- Subpleural parenchymal micronodules are not specific findings for individual lung diseases.
- Their diagnostic utility increases when considered in conjunction with other CT findings and clinical context, particularly for pneumoconiosis, sarcoidosis, and pulmonary lymphangitic carcinomatosis.