Category C disease (opacities greater than 5 cm diameter on chest radiograph occupying more than a third of the right lung field) is commonly accompanied by symptoms of breathlessness.
Occasionally, extensive (category B or C) MPF may be asymptomatic; in such cases arterial blood gases are often normal.
The patient may cough up large amounts of black material.
Chest radiology will reveal large, round opacities in the lung fields.
Lung function tests may reveal a restrictive ventilatory defect:
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