Fig. 8

The tumor was composed of a hypercellular area in the submucosal layer. Tumor cells were homogenous and characterized by bright clear cytoplasm (a H&E × 4, b H&E × 250). Immunohistochemically, the tumor cells were positive for EMA (c). Histology of the primary lesion showed that cells with clear cytoplasm are growing in alveolar form (d H&E × 300)