Figure 6. Microscopic features of the pancreatic tumor showing a particularly complex architecture with arborizing papillae as well as invasive areas characterized by small nests of cells with extracellular mucin accumulation. Invasion front composed of tumor cells with abundant eosinophilic cytoplasm surrounded by abundant mucin. A perineural invasion in the tumor area can also be observed as can a peritumoral desmoplastic stromal reaction.