Chest radiology may reveal diffuse interstitial bilateral perihilar shadowing, though there is a spectrum of appearance ranging from subtle shadowing to extensive consolidation. 10% of radiographs will be normal, whilst 10% will show unusual, perhaps misleading features.
Definitive diagnosis is by bronchial alveolar lavage with silver staining. The lavage is performed using fibreoptic bronchoscopy.
Other tests include:
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