A striking deposition of mineral particles in the lungs of a farmer: a case report

Our plain-English summary of A striking deposition of mineral particles in the lungs of a farmer: a case report, by B. Gylseth, L. Stettler, G. Mowè, et al (American Journal of Industrial Medicine, 1984).

The study

• Authors: B. Gylseth, L. Stettler, G. Mowè, V. Skaug, P. Lexow
• Journal: American Journal of Industrial Medicine
• Published: 1984;6(3):231-40
• Cited by: 19 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

The object of this study was to analyze mineral particles in lung tissue from a farmer who underwent lobectomy due to a lung tumor and relate these analytical findings to occupational exposure and histopathological and clinical diagnoses. Despite no clear evidence of previous occupational dust exposure, heavy deposits of birefringent particles and slight pulmonary fibrosis were found during histopathological examination. Extracts from the lung tissue were analyzed by electron microscopy and X-ray microanalysis for mineral particles. The major components of the dust were identified as mica, talc, and silica. Minor components included asbestos fibers and rutile fibers. Some of these fibers were coated by ferroproteins. Mica, quartz, feldspars (plagioclase), and rutile fibers were found in the soil from the farmer's potato storehouse. Based on these findings it is assumed that the slight pulmonary fibrosis is probably caused by the different mineral particles deposited.

In plain English

This case report described mineral particles in lung tissue from a 53-year-old Norwegian farmer, a non-smoker who produced meat, grain and potatoes. A routine chest X-ray showed an opacity in the left lung, and a lung lobe was removed. The tumor was considered a variety of carcinoid with neuroendocrine differentiation. His work history showed no specific dusty work, although he had used asbestos cement sheets to repair his farmhouse. The lung showed mineral dust deposits, ferruginous bodies, and peribronchial and some interstitial fibrosis. Analysis identified the main minerals as muscovite mica and talc. Of 62 fibers analyzed, 37% were amphibole asbestos (amosite and anthophyllite) and the rest were identified as rutile. The lung contained 4.5 million rutile and 2.7 million asbestos fibers per gram of dried tissue. Soil from his potato storehouse contained mica, quartz, feldspar and rutile fibers, but no talc. The authors classified the case as a mixed dust pneumoconiosis along with the tumor. They wrote that the asbestos fibers may have contributed to the tumor, although to their knowledge such an association had never been reported.

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 (one patient), with microscopic and electron microscopic mineral analysis of lung tissue and of soil from the farm
• Who was studied: One 53-year-old farmer in a rural district of Norway who produced meat, grain and potatoes. He was a non-smoker and had a lung lobectomy for a tumor. Dates are not given.
• Exposure: No specific dusty work in the occupational history apart from general farm work. He had used asbestos cement sheets during repair work on his farmhouse. The fiber type in the sheets is not stated.
• Main results:
  • The lung tumor was considered a variety of carcinoid with multidirectional neuroendocrine differentiation.
  • In the lung tissue, peribronchial and some interstitial fibrosis was present, and ferruginous bodies were observed among the mineral dust deposits.
  • X-ray diffractometry confirmed that the main minerals in the lung were muscovite (mica) and talc.
  • Of 62 fibers analyzed from the lung, 63% gave a titanium X-ray spectrum (identified as rutile) and 37% were identified as amphibole asbestos (amosite and anthophyllite).
  • Mean (geometric) diameter and length were 0.76 and 5.5 micrometres for the rutile fibers and 0.70 and 9.0 micrometres for the amphibole fibers. Some rutile fibers had a ferroprotein coating.
  • By manual analysis, the lung contained 4.5 x 10^6 rutile fibers and 2.7 x 10^6 asbestos fibers per gram of dried tissue.
  • In the automated analysis of 1,154 particles, particles classified as silica, potassium feldspar/mica and talc-like made up over 50% of the exogenous (from outside the body) particles.
  • Soil from the farmer's potato storehouse contained mainly mica, quartz and feldspar (plagioclase). Rutile fibers were also detected, but talc was not found.
• The authors' conclusion: The authors concluded that the case should be classified as a mixed dust pneumoconiosis along with the tumor. They wrote that the asbestos fibers in the tissue may have contributed to the tumor, although to their knowledge such an association had never been reported. They added that talc and silica may have contributed to the fibrosis.
• Limitations the authors state:
  • Talc contamination from surgical gloves during handling of the lobectomy specimen could not be excluded.
  • The automated method may miss small particles; particles less than 0.2 micrometres may be very difficult to detect.
  • Very small, platelike particles such as talc or mica are harder to analyze by the automated method.
  • The automated method does not provide structural information by selected-area electron diffraction.

Topics

Medical terms in this study, explained in our Lexicon: Deposition, Occupational Exposure, Pulmonary Fibrosis, Mica, Talc.

Related studies

• Quantitative x ray microanalysis of pulmonary mineral particles in a patient with pneumoconiosis and two primary lung tumours — S. Anttila, S. Sutinen, et al. (1984)
• Deposition pattern of inorganic particles at the alveolar level in the lungs of rats and mice — A.R. Brody, M.W. Roe (1983)
• Identification of mineral particles in pneumoconiotic lungs — W.J. Henderson, J. Gough, et al. (1970)
• Pulmonary mineral dust. A study of ninety patients by electron microscopy, electron microanalysis, and electron microdiffraction — J.P. Berry, P. Henoc, et al. (1976)
• Accumulation of mixed mineral dusts in the lungs of rats during chronic inhalation exposure — C.H. McMillan, A.D. Jones, et al. (1989)
• Mineral particles of varying composition induce differential chemokine release from epithelial lung cells: importance of physico-chemical characteristics — J. Ovrevik, T. Myran, et al. (2005)

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