ground-glass opacity
Also written as: GGO
A hazy lung abnormality on CT imaging that preserves visibility of underlying vessels and bronchi.
Full Definition
Ground-glass opacity (GGO) is a descriptive term for areas of increased lung attenuation on CT scans that maintain visibility of underlying pulmonary vessels and bronchial walls. In oncologic radiology, GGO can represent early-stage adenocarcinoma, particularly invasive mucinous adenocarcinoma, or treatment-related pneumonitis. The term derives from the appearance resembling frosted or ground glass, where the underlying structures remain visible through the haze. GGO requires careful characterization regarding distribution, associated solid components, and temporal changes, as these features help differentiate inflammatory conditions from malignancy and guide appropriate management strategies.
Usage
Usage note: Hyphenate ground-glass when used as an adjective; GGO acceptable abbreviation in reports.
In Context
- "Scattered ground-glass opacity in the lower lobes raised concern for drug-induced pneumonitis." — Chest CT report
- "The persistent ground-glass opacity with solid components suggested invasive adenocarcinoma." — Lung cancer screening report