in this study , the fiber content of human lungdust specimens has been determined electronmicroscopically for 4 different groups : so called normal lungs ( as a control ) , mesothelioma cases , which may have been spontaneous , or initiated by occupational exposure , fibrosis cases ( without any lung tumour ) after occupational exposure in coal- and talc-mines .
C0024109
lungs
C0024121
lung tumour