Document Detail

Pneumoconiosis in rush mat workers exposed to clay dye "sendo" dust: clinical, radiologic, and histopathologic features in seven patients.
MedLine Citation:
PMID:  14769759     Owner:  NLM     Status:  MEDLINE    
STUDY OBJECTIVES: The purpose of this study was to describe the clinical, chest radiographic, high-resolution CT, and histopathologic features of clay dye "sendo" dust pneumoconiosis in seven rush mat ("tatami") workers. PATIENTS: Seven patients with a history of occupational exposure to sendo dust and radiographic changes suggestive of pneumoconiosis were retrospectively reviewed. RESULTS: The duration of exposure ranged from 15 to 45 years (median, 30 years). Three patients had cough, and four patients had abnormal pulmonary function test results. Chest radiographs showed nodular opacities < 3 mm in diameter (types p and q) in all patients. The standard International Labor Office profusion score ranged from 0/1 to 1/1 (median, 1/0). High-resolution CT demonstrated small nodular opacities (types p and q) in all seven patients. In four patients, high-resolution CT demonstrated branching centrilobular structures, airway ectasia, airway wall thickening, and emphysematous changes. None of the patients had conglomerate nodules, large opacities, honeycombing, pleural effusion, or lymphadenopathy. Microscopic examination of the specimens obtained by open lung biopsy or transbronchial lung biopsy revealed nodular fibrosis with accumulation of dust-laden macrophages, but no silicotic nodules. Needle-like particles of 1 to 20 microm in length were evident among the dust deposits, and birefringent crystals were identified under polarizing microscopy. Four of seven patients showed intra-alveolar fibroblastic foci similar to Masson bodies, accompanied by dust deposition. CONCLUSION: Rush mat workers' sendo dust pneumoconiosis is caused by dust containing free silica. The radiographic and high-resolution CT findings consist of small nodular opacities < 3 mm in diameter and bronchial and bronchiolar abnormalities.
Kiminori Fujimoto; Nestor L Müller; Seiya Kato; Hiroshi Terasaki; Junko Sadohara; Toru Rikimaru; Naofumi Hayabuchi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chest     Volume:  125     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-02-10     Completed Date:  2004-03-11     Revised Date:  2006-04-19    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  United States    
Other Details:
Languages:  eng     Pagination:  737-43     Citation Subset:  AIM; IM    
Department of Radiology, Kurume University School of Medicine, 67 Asahi-machi, Kurume 830-0011, Japan.
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MeSH Terms
Aluminum Silicates / adverse effects
Biopsy, Needle
Chemical Industry*
Middle Aged
Occupational Exposure / adverse effects*
Pneumoconiosis / diagnosis*,  etiology
Radiography, Thoracic
Respiratory Function Tests
Retrospective Studies
Risk Assessment
Sampling Studies
Severity of Illness Index
Tomography, X-Ray Computed
Reg. No./Substance:
0/Aluminum Silicates; 0/Dust; 1302-87-0/clay

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