Pure Ground Glass Nodule

**Semantic type:** Finding

**Definition:** Focal increased opacity through which normal parenchymal structures (airways and vessels) can be seen. If, on lung windows, there is a solid component of greater than or equal to 2 mm that is not vascular or airway, the nodule is not pure ground glass. Visibility of normal underlying interstitium is acceptable.

**Synonyms:** - Pure GGN - Pure Ground Glass