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©2013 UpToDate ® Print Email Acute phase of hypersenstivity pneumonitis (extrinsic allergic alveolitis) CT scan shows ground glass opacification of the lungs during the acute phase of hypersensitivity pneumonitis (extrinsic allergic alveolitis). Several secondary pulmonary lobules are spared and appear as darker areas in both lower lobes. Courtesy of Paul Stark, MD.
©2013 UpToDate ® Print Email Acute phase of hypersenstivity pneumonitis (extrinsic allergic alveolitis) CT scan shows ground glass opacification of the lungs during the acute phase of hypersensitivity pneumonitis (extrinsic allergic alveolitis). Several secondary pulmonary lobules are spared and appear as darker areas in both lower lobes. Courtesy of Paul Stark, MD. Subacute hypersensitivity pneumonitis (extrinsic allergic alveolitis) Subacute hypersensitivity pneumonitis (extrinsic allergic alveolitis) with multiple so-called acinar nodules permeating the entire lung. Courtesy of Paul Stark, MD. Chronic hypersensitivity pneumonitis (extrinsic allergic alveolitis) Chronic phase of hypersensitivity pneumonitis (extrinsic allergic alveolitis) due to birds. Focal honeycombing is present in the right upper lobe and mild bilateral cylindrical bronchiectasis is visible. Courtesy of Paul Stark, MD.