OHST Practice Exam

The pneumoconiosis that is caused by inhalation of iron oxide is known as?

1. Anthracosis

2. Siderosis

3. Silicosis

4. Silicosiderosis

The correct answer is: Siderosis

Siderosis is the term used to describe the pneumoconiosis resulting from the inhalation of iron oxide (Fe2O3) dust. This condition primarily affects individuals who work in industries such as metal working, welding, or foundry work, where iron particles are prevalent. When inhaled, these iron particles can accumulate in the lungs, leading to a range of respiratory issues, and over time, can result in a characteristic radiological appearance on chest X-rays. The other pneumoconioses listed, such as anthracosis, silicosis, and silicosiderosis, are associated with different substances. Anthracosis is related to coal dust inhalation, silicosis is caused by exposure to silica dust, and silicosiderosis refers to a combination of silica and iron exposure. Each condition has distinct pathological and clinical features, but in the case of siderosis, the defining factor is the presence of iron oxide particulates in the respiratory system. Understanding this specificity is crucial for accurate diagnosis and management of occupational lung diseases.