The Morbid Anatomy And Histology Of Asbestosis

Our plain-English summary of The Morbid Anatomy And Histology Of Asbestosis, by S.R. Gloyne (1933).

The study

• Author: S.R. Gloyne
• Published: Tubercle 14:445-451, July; 14:493-497, August; And 14:550-558, September (1933)
• Type of article: Journal article
• Our copy: from Johns-Manville's own medical library, J-M no. 003047. The article is still under copyright, so we describe it here rather than post it.

In plain English

This article, published in parts in Tubercle in 1933, is a hospital pathologist's descriptive account of how asbestosis appears at post-mortem and under the microscope. It drew on the author's post-mortem experience, mostly with crocidolite (blue asbestos), and on the author's own guinea-pig experiments. The available parts gave no total case count. The author described firm, tough lungs with blue-black patches, generally on a reddened background of terminal bronchopneumonia in less affected parts. The scarring was diffuse, without the nodules seen in silicosis. The pleura showed adhesions that could close the pleural space completely, so pleural effusion was rare. Under the microscope the author listed five kinds of particles and a threefold tissue reaction: fibres coated to form asbestosis bodies, collections of dust cells and asbestosis giant cells, and fibrosis. The giant cell was described as not a true single cell. The author's summary stated that asbestosis differed from other dust diseases because of the long, needle-like fibres. It also stated that varying industry conditions made unusual forms of asbestosis likely. The September part is missing from this text.

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: Descriptive pathology account (morbid anatomy and histology) based on the author's post-mortem experience, with references to the author's guinea-pig experiments; not a statistical study
• Who was studied: Lungs and organs of asbestos workers with pulmonary asbestosis examined post-mortem by a pathologist at the City of London Hospital for Diseases of the Heart and Lungs, plus guinea-pigs used in experiments. No case count is given in the available July and August parts. The illustrated case was a female spinner aged 26 who had worked five and a half years.
• Exposure: Asbestos dust, mainly crocidolite (blue asbestos, the chief South African variety) in the author's cases; chrysotile is discussed as the bulk of industrial asbestos
• Main results:
  • To the naked eye, the uncomplicated asbestosis lung showed dense blue-black areas corresponding to the lung's secondary lobules, surrounded by thick bands of connective tissue
  • The reddened background was generally due to terminal bronchopneumonia in the less affected portions of the lung
  • The fibrosis was diffuse, and the nodules characteristic of silicosis were not seen
  • Pleural adhesions were common; in advanced cases the pleural space was completely closed, and pleural effusion was rare
  • Few naked-eye signs of disease were seen in other organs
  • Under the microscope the asbestosis lung showed five kinds of particles: carbon pigment, amorphous brown pigment, jagged probably carbonaceous particles, asbestos fibres, and asbestosis bodies
  • The tissue reaction to the fibre was threefold: thickening of the fibre to form the asbestosis body, cellular changes (dust cells and asbestosis giant cells), and fibrosis common to all pneumoconiosis
  • The asbestosis giant cell was described as not a true single cell
  • The author's guinea-pig experiments showed the tissue reactions to be relatively benign
  • In guinea-pigs injected under the skin, the giant cell was found as early as the tenth day and persisted for many weeks, while asbestosis bodies formed very slowly
  • In the uncomplicated human lesion, white blood cells (leucocytes) were not prominent
  • Asbestos fibre was not destroyed by concentrated sulphuric acid
• The authors' conclusion: The author concluded that the result of dust inhalation in pulmonary asbestosis differs from other dust diseases because of the long needle-like fibres. The author also concluded that variation in industry conditions makes it probable that unusual forms of asbestosis will occur.
• Limitations the authors state:
  • Asbestos workers are prone to other respiratory diseases (such as pulmonary tuberculosis and bronchopneumonia) that may confuse the anatomical picture
  • In ordinary stained sections the fibres are often obscured by other foreign particles
  • The author was uncertain whether the appearance of fibres protruding from giant cells reflected the true situation, because long fibres tend to lie obliquely

Topics

Medical terms in this study, explained in our Lexicon: Histology, Crocidolite, Silicosis, Pleura, Pleural Effusion, Fibrosis.

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