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Scatterplot of percentage change in nodule size by length of time between the index study and prior studies on which the nodule was retrospectively identified, shown with regression line (r = 0.01, NS). There is no change with time, suggesting that the nodules are slow growing. The apparent difference in nodule size between the index and prior studies is presumably because the prior images were, by definition, not optimized to cut through the maximum diameter of the nodules.
