Fig. 2.

Cribriform and tubular growth. ACC contains cells with hyperchromatic angulated nuclei that generally form at least focal well-formed cribriform spaces (a, × 20); tubular growth in ACC tends to be biphasic with distinct ductal and myoepithelial elements (b, × 20). Classic PAC is comprised of monophasic strands and tubules that show a streaming appearance (c, × 20) while CAMSG has mostly poorly-formed cribriform spaces with additional glomeruloid and tubular patterns (d, × 20). PA demonstrates a broad range of architectural patterns and stromal appearances with both ductal and myoepithelial components (e, × 20). CA consists of anastomosing cords of basaloid cells with a beaded appearance (f, × 20)