Fig. 2

Rates of progressive cavities stratified by maximum inner diameter and consolidation around the initial cavity. Progression rates were 21.2% in patients with maximum inner diameter < 10 mm and without consolidation around the initial cavity, 46.4% in those with maximum inner diameter ≥ 10 mm and without consolidation, 70% in patients with maximum inner diameter < 10 mm and with consolidation, and 96.2% in patients with maximum inner diameter ≥ 10 mm and with consolidation. The rate of progressive cavities increased significantly with the presence of a maximum inner diameter of 10 mm and consolidation around the cavity