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Subradiological silicosis.

Rodney Ehrlich1, Jill Murray2, David Rees3

  • 1Centre for Occupational and Environmental Health Research, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.

American Journal of Industrial Medicine
|September 22, 2018
PubMed
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Many cases of silicosis are missed on chest X-rays, even when lung tissue shows significant disease. This "subradiological silicosis" impacts research and worker compensation.

Area of Science:

  • Occupational Medicine
  • Pulmonary Pathology
  • Radiology

Background:

  • Silicosis is a serious lung disease caused by silica dust inhalation.
  • Radiological imaging is the primary method for diagnosing silicosis in clinical practice.
  • A significant proportion of silicosis cases may be missed by standard radiological assessments.

Purpose of the Study:

  • To highlight the underrecognized issue of subradiological silicosis.
  • To discuss the implications of subradiological silicosis for research and clinical practice.

Main Methods:

  • Analysis of a large South African autopsy database of deceased miners.
  • Comparison of pathological findings with antemortem chest radiographs.
  • Assessment of silicosis detection rates using International Labour Organization (ILO) criteria.
Keywords:
South Africaautopsypathologyradiologysilicosis

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Main Results:

  • Only 43% of pathologically confirmed silicosis cases were detected radiologically using ILO >1/0 criteria.
  • Even among cases classified as "moderate or marked" by pathology, only 62% were identified on chest radiographs.
  • This indicates a substantial underdiagnosis of silicosis via standard radiological screening.

Conclusions:

  • Subradiological silicosis is a prevalent issue, particularly in occupational settings with high silica exposure.
  • Underdiagnosis impacts dose-response studies, silica-related disease research (TB, cancer, autoimmune), prognostication, and workers' compensation.
  • Further research and potentially revised diagnostic strategies are needed to address this phenomenon.