209 Reproducibility study on invasiveness of pulmonary AdC with a modified classification Figure 2. Distribution of pathologist’s pattern scores across 70 cases is shown for the first round in A. Note that a score close to 100 is considered maximal concordance. In the second round (B) the ‘grey zone’ was added for areas that contained more epithelial stratification than fitted for iatrogenic collapsed AIS and not enough to fit into one of the other patterns. Note the large variation on the quantitative scores for a pattern: this covers not infrequently a range of 70% between pathologists. 15
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