has been known for 50 years that inhalation of asbestos dust can lead to appearances on chest roentgenograms that are different from those associated with silicosis and coal workers’ pneumoconiosis.1 However, only the latest international classifications of the radiographic appearances of the pneumoconioses allow the recording of such shadows.2’3 These include what are now called small irregula...

Silicosis, the most prevalent of the pneumoconioses, is caused by inhalation of crystalline silica particles. Silica-exposed workers, with or without silicosis, are at increased risk for tuberculosis and nontuberculous mycobacteria-related diseases. The risk of a patient with silicosis developing tuberculosis is higher (2.8 to 39 times higher, depending on the severity of the silicosis) than th...

Silicosis, the most prevalent of the pneumoconioses, is caused by inhalation of crystalline silica particles. Silica-exposed workers, with or without silicosis, are at increased risk for tuberculosis and nontuberculous mycobacteria-related diseases. The risk of a patient with silicosis developing tuberculosis is higher (2.8 to 39 times higher, depending on the severity of the silicosis) than th...

A significant proportion of workers exposed to silica dust are at risk of developing tuberculosis (TB). The higher the International Labor Organization (ILO) category of silicosis, the greater the TB risk. Subtle radiographic presentations of TB may be the initial manifestation of TB, particularly in the absence of sputum identification of TB bacilli. A proposed TB x-ray-reading form in additio...

The lung has a limited number of patterns of reaction to inhaled particles. The disease observed depends upon the location: conducting airways, terminal bronchioles and alveoli, and upon the nature of inflammation induced: acute, subacute or chronic. Many different agents cause narrowing of conducting airways (asthma) and some of these cause permanent distortion or obliteration of airways as we...

BACKGROUND Our annual analysis of the epidemiology of occupational diseases is intended to indicate morbidity categories characterized by the highest risk of developing pathologies associated with working conditions and to assay variations in the frequency of those pathologies, depending on occupational exposure, medical factors, social and economic circumstances, legal regulations, and ongoing...

STUDY OBJECTIVE To assess the efficacy of the chest radiograph in identifying patients with miliary tuberculosis. DESIGN Retrospective case-controlled review by three independent blinded chest radiologists. SETTING Provincial tuberculosis control center. PATIENTS Population-based sample, including all proved cases of miliary tuberculosis diagnosed in the Province of British Columbia, Cana...