What are GGN and GGO?
= GGN
Among various types of the small-cell and non-small-cell lung cancers, adenocarcinoma is the most prevalent type, accounting for more than a third of all primary lung tumors.
A type of adenocarcinoma known as small peripheral adenocarcinomas aka ground-glass nodule (GGN) is the common radiographic appearance of such small peripheral lung adenocarcinomas.
Radiographic Characteristics of GGNs
Radiologically speaking, GGN represents a type of pulmonary nodules (i.e., localized increase of
attenuation in the lung parenchyma of a X-ray CT image), which does not completely obscure
the underlying normal parenchymal structures such as airways, vessels and interlobular septa (i.e.,
presenting a focal ground-glass opacity or GGO). GGN is also known as subsolid nodule, while
those that completely obscure the lung parenchyma are called solid nodules. GGN covers a spectrum between completely-not-solid and almost-solid opacities, which are clinically categorized
into two subtypes: pure and mixed GGNs. For the pure GGNs, the appearance of the entire nodule
is subsolid, while the mixed GGNs consists of a combination of solid and subsolid components.
= GGO
In radiology, ground glass opacity (GGO) is a nonspecific finding on computed tomography (CT) scans that indicates a partial filling of air spaces in the lungs by exudate or transudate, as well as interstitial thickening or partial collapse of lung alveoli.
URL: https://pdfs.semanticscholar.org/cecf/effcaa73d29b171fb7d8ec115bf1fd42e911.pdf
URL: https://en.wikipedia.org/wiki/Ground-glass_opacity
Among various types of the small-cell and non-small-cell lung cancers, adenocarcinoma is the most prevalent type, accounting for more than a third of all primary lung tumors.
A type of adenocarcinoma known as small peripheral adenocarcinomas aka ground-glass nodule (GGN) is the common radiographic appearance of such small peripheral lung adenocarcinomas.
Radiographic Characteristics of GGNs
Radiologically speaking, GGN represents a type of pulmonary nodules (i.e., localized increase of
attenuation in the lung parenchyma of a X-ray CT image), which does not completely obscure
the underlying normal parenchymal structures such as airways, vessels and interlobular septa (i.e.,
presenting a focal ground-glass opacity or GGO). GGN is also known as subsolid nodule, while
those that completely obscure the lung parenchyma are called solid nodules. GGN covers a spectrum between completely-not-solid and almost-solid opacities, which are clinically categorized
into two subtypes: pure and mixed GGNs. For the pure GGNs, the appearance of the entire nodule
is subsolid, while the mixed GGNs consists of a combination of solid and subsolid components.
= GGO
In radiology, ground glass opacity (GGO) is a nonspecific finding on computed tomography (CT) scans that indicates a partial filling of air spaces in the lungs by exudate or transudate, as well as interstitial thickening or partial collapse of lung alveoli.
URL: https://pdfs.semanticscholar.org/cecf/effcaa73d29b171fb7d8ec115bf1fd42e911.pdf
URL: https://en.wikipedia.org/wiki/Ground-glass_opacity
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