simple nodular silicosis - usually asymptomatic; there may be nodular shadowing on chest radiograph
advanced nodular silicosis - usually presents with a cough and exertional dyspnoea; chest radiograph reveals widespread confluent shadowing, thin streaks of calcification are seen around the hilar lymph nodes ('eggshell' calcification); pulmonary function tests - restrictive ventilatory defect and impairment of gas transfer
silicosis tends to be progressive long after removal from the source of exposure
the condition may also occur with pulmonary tuberculosis
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