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Ground-glass opacity (GGO) is a finding seen on chest x-ray (radiograph) or computed tomography (CT) imaging of the lungs. It is typically defined as an area of hazy opacification (x-ray) or increased attenuation (CT) due to air displacement by fluid, airway collapse, fibrosis , or a neoplastic process . [ 1 ]
There may be mild ground-glass opacity; Indeterminate for UIP: [4] Predominantly subpleural and basal; Subtle reticular pattern; May have mild ground-glass opacity or distortion (“early UIP pattern”) Findings suggestive of another diagnosis, including: [4] Other predominant distribution: Peribronchovascular; Perilymphatic; Upper or mid-lung ...
What’s more, the type of X-ray reportedly seen in connection with many Chinese cases has a different appearance: not white, but with "ground-glass opacities," which can signal more serious illness.
Typically, an area of white lung is seen on a standard X-ray. [5] Consolidated tissue is more radio-opaque than normally aerated lung parenchyma, so that it is clearly demonstrable in radiography and on CT scans. Consolidation is often a middle-to-late stage feature/complication in pulmonary infections.
A chest X-ray showing a very prominent wedge-shape area of airspace consolidation in the right lung characteristic of acute bacterial lobar pneumonia. Ground glass. extrinsic allergic alveolitis; desquamative interstitial pneumonia; alveolar proteinosis; infant respiratory distress syndrome (RDS) Consolidation. pneumonia; alveolar haemorrhage
On high resolution computed tomography, airspace consolidation with air bronchograms is present in more than 90% of patients, often with a lower zone predominance. A subpleural or peribronchiolar distribution is noted in up to 50% of patients. Ground glass appearance or hazy opacities associated with the consolidation are detected in most patients.
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Clinical tests include chest radiography or (HRCT) which may show centrilobular nodular and ground-glass opacities with air-trapping in the middle and upper lobes of the lungs. Fibrosis may also be evident. Bronchoalveolar Lavage (BAL) findings coinciding with pneumonitis typically include a lymphocytosis with a low CD4:CD8 ratio. [7] [13]