Subpleural Curvilinear Shadow in Interstitial Pulmonary Diseases.
Kasuga-H; Narita-N; Tamura-M; Morikawa-S; Katada-H; Miyazaki-R; Hatakeyama-M; Otsuji-H; Yoshimura-H; Uchida-H
NIOSH 1990 Nov:1419-1423
The prevalence rate of the subpleural curvilinear shadow (SCLS) was examined in several interstitial pulmonary diseases and in asbestos (1332214) workers with normal chest roentgenograms in an effort to analyze the significance of the SCLS in pulmonary asbestosis. The study involved 22 patients with pulmonary asbestosis who ranged in age from 40 to 64 years and with duration of exposure to asbestos from 15 to 43 years. Results were also presented of the occurrence of SCLS in two other studies. SCLS was observed in 17 of 22 cases with pulmonary asbestosis. SCLS was also detected in 33 patients with idiopathic pulmonary fibrosis (IPF) and nine of 23 with collagen vascular diseases (CVD). SCLS was not detected in lung cancer. The prevalence rate of SCLS in asbestosis was statistically higher than in IPF and CVD. In another study of current asbestos workers who had been exposed for an average of 27 years but who had no findings of pulmonary asbestosis on their chest roentgenograms, SCLS was observed in seven of 22 cases. No differences were noted between workers with and without SCLS in sex, age, duration of asbestos exposure, and smoking habit. In the final study including both patients with asbestosis and active workers in the asbestos field the SCLS prevalence rates were observed to increase in proportion to the International Labour Organization classification. The authors conclude that SCLS on high resolution computed tomographic scan was useful for early detection of pulmonary asbestosis in asbestos workers.
Respiratory-system-disorders; Lung-disease; Pulmonary-function-tests; Lung-function; Asbestos-fibers; Asbestos-workers; Long-term-exposure; Morbidity-rates;
DHHS (NIOSH) Publication No. 90-108
Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Respiratory-system-disorders;
Proceedings of the VIIth International Pneumoconioses Conference