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Ground-glass opacity is in contrast to consolidation, in which the pulmonary vascular markings are obscured. [3] [5] GGO can be used to describe both focal and diffuse areas of increased density. [5] Subtypes of GGOs include diffuse, nodular, centrilobular, mosaic, crazy paving, halo sign, and reversed halo sign. [6]
A lung nodule or pulmonary nodule is a relatively small focal density in the lung. A solitary pulmonary nodule (SPN) or coin lesion, [1] is a mass in the lung smaller than three centimeters in diameter. A pulmonary micronodule has a diameter of less than three millimetres. [2] There may also be multiple nodules.
The non-fibrotic form is typically characterized by ground glass opacities, mosaic attenuation, ill-defined centrilobular nodules (<5 mm), and air trapping. [12] The fibrotic form is typically characterized by irregular linear opacities/coarse reticulations, traction bronchiectasis , and honeycombing , patchy ground-glass attenuation ...
may cavitate (necrobiotic lung nodules) cavitation of a peripheral nodule can lead to pneumothorax or haemopneumothorax. follicular bronchiolitis small centrilobular nodules or tree-in-bud; rare; Caplan syndrome; Echocardiogram (may show pulmonary hypertension) Lung biopsy (bronchoscopic, video-assisted, or open), which may show pulmonary lesions
The presence of lung nodules on high resolution CT is a keystone in understanding the appropriate differential. Typically, the distribution of nodules is divided into perilymphatic, centrilobular and random categories. Furthermore, nodules can be ill-defined, implying they are in the alveoli, or well defined, suggesting an interstitial position ...
The bilateral bronchiectasis and prominent centri-lobular nodules with a "tree-in-bud" pattern shows noticeable improvement. The diagnosis of DPB requires analysis of the lungs and bronchiolar tissues, which can require a lung biopsy, or the more preferred high resolution computed tomography (HRCT) scan of the lungs. [7]
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