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Radiology, Vol 171, 117-123, Copyright © 1989 by Radiological Society of North America

ARTICLES

Radiographic type p pneumoconiosis: high-resolution CT

M Akira, T Higashihara, K Yokoyama, S Yamamoto, N Kita, S Morimoto, J Ikezoe and T Kozuka
Department of Radiology, National Kinki Chuo Hospital for Chest Disease, Osaka, Japan.

High-resolution computed tomography (CT) was performed in 90 patients with pneumoconiosis who had small rounded opacities on radiographs. The CT appearances of radiographic type p small rounded opacities in 55 patients were compared with the appearances of type q and r opacities. Radiographic type p pneumoconiosis on high-resolution CT scans was characterized by tiny binary branching structures or a gathering of a few dots. In 21 of the 55 patients, nonperipheral, small areas of low attenuation with a central dot were found. On the basis of CT- pathologic correlation in two postmortem specimens, these tiny opacities and areas of low attenuation corresponded to irregular fibrosis around and along the respiratory bronchioles and to focal-dust emphysema, respectively. Focal emphysema was most commonly found in pneumoconiosis with p-type changes and can be identified with high- resolution CT scanning. The addition of high-resolution CT to chest radiography is useful in achieving more accurate categorization of the lesions.


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