A Review Of Our Present Knowledge Of Pneumoconiosis, Based Upon Roentgenologic Studies, With Notes On The Pathology Of The Condition

Our plain-English summary of A Review Of Our Present Knowledge Of Pneumoconiosis, Based Upon Roentgenologic Studies, With Notes On The Pathology Of The Condition, by H. K. Pancoast, E. P. Pendergrass (1925).

The study

• Authors: H. K. Pancoast, E. P. Pendergrass
• Published: American Journal Of Roentgenology 14(5):381-423, November (1925)
• Type of article: Journal article
• Our copy: from Johns-Manville's own medical library, J-M no. 003124.

In plain English

This 1925 article reviewed what was then known about pneumoconiosis, lung disease from inhaled dust, mainly from chest X-ray studies, with notes on its pathology. The authors also recorded X-ray findings from their own cases in many dusty trades, grouped into first, second and third stages. Among their own cases were 17 asbestos workers, examined with Miller and Landis: 2 showed first stage changes and 15 showed definite second stage appearances. In these asbestos workers the nodular shadows were described as "soft" and varying in size. Very slight nodular shadows appeared in one man after two years' work. The authors described asbestos as a magnesium silicate whose crushed rock contains free silica. They wrote that the actual danger in asbestos and cement works seemed comparatively slight. They regarded a fatal asbestos case reported by Cook as largely tuberculous. Their own cases also included 58 potters and 20 cement workers. The authors considered that serious damage was probably due to silica, and they urged wider X-ray study of dusty industries. They noted that their coal miner figures covered only positive cases.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Literature review of pneumoconiosis from the X-ray (roentgenologic) and pathological standpoints, combined with the authors' own series of X-ray examinations of workers in dusty trades
• Who was studied: The authors' own cases from several US dusty industries, including 17 asbestos workers, 58 potters with pneumoconiosis, 20 cement workers, 84 coal miners with pneumoconiosis and 24 metal grinders. Some were examined with Miller and Landis at the University of Pennsylvania, others for the US Bureau of Mines.
• Exposure: Mainly free silica dust in mining, granite cutting, pottery, grinding and other trades. Asbestos dust is described as a magnesium silicate, with the crushed rock containing more or less free silica.
• Main results:
  • Asbestos workers (17, examined with Miller and Landis): 2 showed first stage changes and the other 15 showed definite second stage appearances
  • Asbestos workers: among the men longest at work, one showed very definite diffuse "soft" spots throughout both lungs after seventeen years' occupation. Very slight nodular shadows were found in one man after only two years.
  • Asbestos workers: in all instances the nodular shadows were characteristically "soft" and varied considerably in size
  • In second stage cases, the nodules were less dense and less sharply defined in coal miners and potters, and still less so in cement and asbestos workers
  • The authors stated that the actual danger in asbestos and cement works seemed comparatively slight
  • Potters with definite pneumoconiosis (58): 9 showed first stage, 28 second stage and 21 third stage appearances
  • Cement workers (20): 5 showed possible first stage changes and 15 showed definite second stage appearances
  • The authors regarded an asbestos worker's death reported by Cook (another author) as largely a tuberculous case
• The authors' conclusion: The authors thought it probably true that all serious damage is due to silica. They urged more widespread X-ray study of dusty industries to lessen the dangers to workers.
• Limitations the authors state:
  • The authors said their coal miner statistics mean little because they had records only of positive cases
  • The authors acknowledged they may be wrong in assuming that silica is not the sole cause of pneumoconiosis

Topics

Medical terms in this study, explained in our Lexicon: Pneumoconiosis, Pathology, Chest X-Ray, Silicate.

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