Chest Imaging

Silicoproteinosis

(also called acute silicosis), an alveolar lipoproteinosis which occurs after a very heavy exposure to small particles (less than 5-7 mm) of silica (quartz, cristobalite or tridymite).

Initial changes consist of a diffuse haze in the lower lung fields. Later, ground-glass appearances, as well as coarse linear or rounded opacities are seen. A miliary picture with very small round opacities may also occur in the lower lung fields.

The diagnosis of alveolar proteinosis may be readily made by the appearance of the bronchoalveolar fluid, which has a characteristic milky appearance. It is estimated that up to half the cases of alveolar proteinosis may be due to acute silicosis.

 

JV