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Chronic hypersensitivity pneumonitis. HRCT at the level of the lower lobes demonstrates a coarse “reticular pattern” with traction bronchiolectasis and bronchiectasis, thickening of the intralobular and peribronchovascular interstitium and ground-glass opacity. The presence of lobular areas of decreased attenuation offers a “key” for the diagnosis of chronic hypersensitivity pneumonitis
