188 Chapter 14 Figure 9. Histologic examples of the intra-alveolar surrogate invasive growth patterns In each row respectively from left to right H&E, Cytokeratin 7 and elastin stainings. Note in the elastin stainings in all patterns a preserved pre-existing alveolar architecture with elastin fibers present. A, solid with alveolar filling; B, cribriform; C, micropapillary; D, papillary; E, grey zone in biological collapse.
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