Acute silicosis clinical manifestation is
Ans. is 'a' i.e., Pulmonary alveolar proteinosis Silicosis Silicosis is a lung disease caused by inhalation of cystalline silicon diaoxide (silica). o currently, it is the most prevalent occupational disease in the world. o There are three types of silicosis - i) Acute silicosis Results from sho-term exposure to a very large amounts of silica. A subset of acute silicosis is silicoproteinosis the chest radiographic appearance of which mimic pulmonary alveolar proteinosis. A miliary picture with very small round opacities may also occur in lower lung fields. ii) Accelerated silicosis Occurs after exposure to large amounts of silica over a shoer period of time (4-8 years). Inflammation, scarring and symptoms progress faster than chronic silicosis. iii) Chronic silicosis Results from long term exposure (more than 20 years) of low amounts of silica dust. Nodules in upper zones of lung. Fibrotic lesions in hilar lymph node & pleura Progressive massive fibrosis increased susceptibility of TB --> silicotuberculosis
Pulmonary alveolar proteinosis
Hypersensitivity penumonitis
Hypersensitivity pneumonia
Forms nodules and causes pneumoconiosis