Ground-glass opacity is a non-specific term that refers to the presence of increased hazy opacity within the lungs that is not associated with obscured underlying vessels (obscured underlying vessels is known as consolidation). It can reflect minimal thickening of the septal or alveolar interstitium, thickening of alveolar walls, or the presense of cells or fluid filling the alveolar spaces. In an acute setting, it can represent active disease such as pulmonary edema, pneumonia, or diffuse alveolar damage.
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