Abstract
Ground-Glass opacity (GGO) is a nonspecific finding which represents a hazy area of increased attenuation in the lung with preservation of bronchial and vascular margins (↑). GGO usually manifests the presence of lung lesions, morphological features of which are beyond the resolution of modern computed tomography. It may be caused by normal expiration, partial collapse of alveoli, increased capillary blood volume, partial filling of air spaces, or interstitial thickening. In patients with acute clinical symptoms, the presence of GGO reflects an active disease (e.g., pneumonia, edema, diffuse alveolar damage). In most patients with chronic symptoms, GGO also indicates active and potentially treatable stages of a long-lasting pathologic process (e.g., interstitial pneumonia, hypersensitivity pneumonitis, and sarcoidosis). GGO may also be found in patients with pulmonary adenocarcinoma that assumes dynamic control or morphological verification.
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Yadav P, Seith A, Sood R (2006) The 'dark bronchus' sign: HRCT diagnosis of Pneumocystis carinii pneumonia. Ann Thorac Med 2(1):26–27. https://doi.org/10.4103/1817-1737.30359
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Yudin, A. (2023). Ground-Glass Opacity and Dark Bronchus Sign. In: Metaphorical Signs in Computed Tomography of Chest and Abdomen. Springer, Cham. https://doi.org/10.1007/978-3-031-24494-0_5
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DOI: https://doi.org/10.1007/978-3-031-24494-0_5
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