Radiological Findings in the Case Exposed to Zirconium

Our plain-English summary of Radiological Findings in the Case Exposed to Zirconium, by M. Demirci Atik, A. Taylan, E.S. Uçan (Turkish Thoracic Journal, 2022).

The study

• Authors: M. Demirci Atik, A. Taylan, E.S. Uçan
• Journal: Turkish Thoracic Journal
• Published: 2022;23(6):426-429
• Cited by: 2 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

Abstract

Pneumoconiosis is a lung disease that develops as a result of a tissue reaction that occurs with the accumulation of inorganic particles. Pathoclinical features may vary depending on the type of inhaled particle. Today, fibrotic and nonfibrotic tissue reactions are well defined in some substances. For example, it is known that exposures such as silica, asbestos, beryllium, and talc are associated with fibrosis in the lung, while exposures such as iron, tin, and barium sulfate cause non-fibrogenic changes. However, the pathoclinic and radiological findings of some rare exposures such as zirconium are not widely known. In a 52-year-old dental technician with a 26-year history of zirconium exposure, more prominent parenchymal emphysematous and fibrotic changes were detected in the upper zones of the thorax high-resolution computed tomography. Since zirconium exposure was clearly defined, radiological findings of this case may be useful to current literature.

In plain English

This article was a case report about one worker exposed to zirconium. Asbestos was mentioned only as background. The patient was a 52-year-old man, a smoker for 30 years, who came to hospital with increasing breathlessness on exertion. For the past 26 years of his work as a dental technician, he had made only zirconium substructures, using a CNC machine and finishing them with a micromotor. Lung function tests showed an FEV1 of 2800 mL (79% of predicted), an FVC of 3730 mL (85% of predicted) and an FEV1/FVC ratio of 75%. High-resolution CT showed emphysema mainly in the upper lobes and fibrotic areas with traction bronchiectasis. It also showed ill-defined micronodules in the mid to lower zones and calcified lymph nodes in the chest. He declined invasive testing. He was diagnosed with pneumoconiosis based on his work history and his clinical and radiological findings. The authors noted that no pathological examination was done. They also noted that silica and metal dust exposure 28 years earlier, and his smoking, were confounders. The authors concluded that the health effects of zirconium compounds remain unknown, and that scientific certainty should not come before protective measures at work.

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 (single patient)
• Who was studied: one 52-year-old male dental technician admitted to hospital with increased exertional dyspnea; 30-year smoking history, no previous tuberculosis or pneumonia
• Exposure: zirconium dust: for the past 26 years he had designed and produced only zirconium substructures, producing zirconium products on a CNC machine and finishing them with a micromotor
• Main results:
  • Pulmonary function in the patient: FEV1 2800 mL (79% of predicted), FVC 3730 mL (85% of predicted), FEV1/FVC ratio 75%
  • The patient's chest x-ray was reported under the ILO classification as quality 2 (scapula), s/p 1/1, ax, hi
  • High-resolution CT of the patient showed centriacinar, paraseptal emphysema, predominant in the upper lobes
  • High-resolution CT of the patient showed bilateral fibrotic areas with traction bronchiectasis and structural distortion in the apices
  • High-resolution CT of the patient showed ill-defined centriacinar micronodules in the mid to lower zones
  • The patient had multiple calcified mediastinal and bilateral hilar lymph nodes
  • The patient declined invasive intervention and was diagnosed with pneumoconiosis based on occupational history and clinical and radiological findings
  • Basis of the pneumoconiosis diagnosis: occupational history, clinical findings and radiological findings
• The authors' conclusion: The authors concluded that the health effects of zirconium compounds, widely used in many sectors, remain unknown, but that scientific certainty should not be a precondition for protective measures in workplaces
• Limitations the authors state:
  • Pathological examination could not be performed because the patient refused
  • Silica and metal dust exposure for 6 months, 28 years earlier, were important confounders
  • The patient's smoking history was relevant to the centrilobular ground-glass nodules and emphysema seen on HRCT

Topics

Medical terms in this study, explained in our Lexicon: Pneumoconiosis, Talc, Fibrosis, Fibrogenic, Thorax.

Related studies

• Radiological findings as predictors of mortality in Quebec asbestos workers — F.D. Liddell, J.C. McDonald (1980)
• A retrospective study on radiological findings of diffuse pleural thickening with benign asbestos pleural effusion in Japanese cases — T. Kishimoto, K. Kato, et al. (2022)
• Pulmonary fibrosis in asbestos insulation workers with lung cancer: a radiological and histopathological evaluation — H.M. Kipen, R. Lilis, et al. (1987)
• Pathologica, physiological, and radiological correlations in the pneumoconioses — E.A. Gaensler, C.B. Carrington, et al. (1972)
• A Significant Metabolic and Radiological Response after a Novel Targeted MicroRNA-based Treatment Approach in Malignant Pleural Mesothelioma — S.C. Kao, M. Fulham, et al. (2015)
• Radiological characteristics, histological features and clinical outcomes of lung cancer patients with coexistent idiopathic pulmonary fibrosis — K.A. Khan, M.P. Kennedy, et al. (2015)

Browse return to medical research.