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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 ]
In A, axial CT scan of the chest showing a right lower lobe pulmonary nodule surrounded by areas of ground-glass opacity (the CT halo sign). In B, axial CT scan of the chest showing multiple, randomly distributed pulmonary nodules surrounded by the CT halo sign; the final diagnosis was aspergillosis. Differential diagnosis: temporal arteritis
The mean radiation dose to an adult from a chest radiograph is around 0.02 mSv (2 mrem) for a front view (PA, or posteroanterior) and 0.08 mSv (8 mrem) for a side view (LL, or latero-lateral). [1] Together, this corresponds to a background radiation equivalent time of about 10 days.
Bat wing appearance is a radiologic sign referring to bilateral perihilar lung shadowing seen in frontal chest X-ray and in chest CT. [1] [2] The most common reason for bat wing appearance is the accumulation of oedema fluid in the lungs. [3] The batwing sign is symmetrical, usually showing ground glass appearance and spares the lung cortices. [4]
There may be superimposed CT features such as mild ground-glass opacity, reticular pattern and pulmonary ossification. Probable UIP pattern: [4] Predominantly subpleural and basal; Often heterogenous distribution; Reticular pattern with peripheral traction bronchiectasis or bronchiolectasis; There may be mild ground-glass opacity; Indeterminate ...
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Atypical adenomatous hyperplasia (AAH) is considered a pre-cancerous lesion, and is thought to further progress to adenocarcinoma in situ and invasive adenocarcinoma of the lung. The lesions of AAH are <5 mm, can be single or multiple, and have a ground glass appearance on CT imaging.
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