Massive pulmonary fibrosis from the inhalation of talc

Our plain-English summary of Massive pulmonary fibrosis from the inhalation of talc, by A.C. Hunt (Thorax, 1956).

The study

• Author: A.C. Hunt
• Journal: Thorax
• Published: 1956;11(4):287-94
• Cited by: 24 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text
• In J-M's library: Johns-Manville's company medical library held a copy (J-M no. 002676).

In plain English

This article is a case report of one man who developed massive scarring (fibrosis) of both lungs after breathing talc dust. For 10 years, between the ages of 35 and 45, he cast lead accumulator (battery) plates in moulds that he dusted with talc from a cloth bag, in a small room with no dust extraction. Chest X-rays over the last nine years of his life showed small spots that enlarged, merged into large masses and developed cavities. Even so, the author reported that his disability was negligible compared with the state of his lungs. He died suddenly at 57, and death was considered due to acute cardiac failure. At autopsy both lungs held hard fibrous masses with cavities and dead tissue, and giant cells packed with particles. Dust recovered from the lungs was over 90% talc, with less than 0.5% quartz, perhaps 2 or 3% kaolin, and no evidence of tremolite. Asbestos-like bodies were present in small numbers. The author wrote that the role of tuberculosis could not be definitely assessed, although no tubercle bacilli were ever found in his sputum.

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: Case report of a single patient, with clinical history, serial chest radiographs, post-mortem examination, histology and mineralogical analysis of lung dust
• Who was studied: One man, 57 years old at death, who worked in the accumulator (lead battery) industry. He was followed as an out-patient at the Miller General Hospital, Greenwich, for nine years before his death. The report comes from the Department of Forensic Medicine, The London Hospital Medical College.
• Exposure: Commercial talc dust during 10 years of hand-casting lead accumulator plates. Talc was banged onto the moulds from a calico bag or old sock, raising a dust cloud, with no dust extraction. The talc source could be traced only for the last two years of this period, when it came from Manchuria, Canada, or Egypt. Before this he did lead burning without dust exposure, and afterwards his talc exposure was negligible.
• Main results:
  • Radiographs over the last nine years of life showed small opacities and larger mottled opacities that grew, became confluent and later cavitated. By death, large opacities occupied the middle two-thirds of both lung fields.
  • Despite the X-ray changes, the patient's physical state was remarkably good, and he was not breathless on normal exertion.
  • He died suddenly. Apart from the lung changes, nothing at autopsy explained the death, which was considered to be from acute cardiac failure.
  • Under the microscope, the fibrous masses contained seams of macrophages and foreign-body giant cells packed with doubly refractile particles under polarized light, along with large areas of necrosis (dead tissue).
  • Dust recovered from the lungs was 3.5% of the wet weight. For the total wet weight of both lungs (1,945 g), this corresponded to 68 g of dust.
  • X-ray diffraction indicated over 90% talc in the lung dust, with less than 0.5% quartz and perhaps 2 or 3% kaolin.
  • No tremolite was detected in the lung dust.
  • The talc from the lungs resembled reference samples from Egypt, Italy, or China. It did not resemble samples from Norway, Sweden, U.S.A., Canada, Austria, India, or the French Pyrenees.
  • Asbestos-like bodies (a single fibre with terminal rosettes, similar but not identical to asbestos bodies) were present in this case, but in small numbers.
  • Sputum was examined for tubercle bacilli four to six times a year over nine years, and no tubercle bacilli were ever found.
  • No acid-fast bacilli were seen in the lung tissue sections examined after death.
• The authors' conclusion: The author summarized that a man exposed for 10 years to talc dust developed pulmonary fibrosis that became confluent and cavitated, and that his disability was negligible compared with the state of his lungs. The author also noted that no tremolite was found in this case, and suggested the cavities may have formed by the merging of necrotic areas.
• Limitations the authors state:
  • No joints were examined histologically after death, so rheumatoid arthritis could not be excluded as the cause of the joint changes.
  • The role of tuberculosis in the cavitation could not be definitely assessed. One of the patient's sons had developed tuberculosis, possibly coincidentally.
  • The source of the talc could not be traced except for the last two years of the exposure period.

Topics

The National Library of Medicine indexes this study under subjects our site covers: Talc and vermiculite.

Medical terms in this study, explained in our Lexicon: Pulmonary Fibrosis, Talc.

Related studies

• Dose-responsive increases in pulmonary fibrosis after inhalation of asbestos — T.R. Quinlan, J.P. Marsh, et al. (1994)
• Inhalation Toxicity of Talc — N.F. Johnson (2021)
• Inhibition of lung injury, inflammation, and interstitial pulmonary fibrosis by polyethylene glycol-conjugated catalase in a rapid inhalation model of asbestosis — B.T. Mossman, J.P. Marsh, et al. (1990)
• Massive bilateral upper lobe fibrosis secondary to asbestos exposure — R.A. Green, D.G. Dimcheff (1974)
• Some investigations into the nature and cause of massive fibrosis (MF) in the lungs of South African gold, coal, and asbestos mine workers — M.C. Leibowitz, B. Goldstein (1987)
• Exposure to asbestiform minerals and radiographic chest abnormalities in a talc mining region of upstate New York — E.F. Fitzgerald, A.D. Stark, et al. (1991)

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