Fig. 3.

Macroscopic and histological findings of the resected tumor in the right submandibular gland. (A) Resected submandibular gland. (B) HE staining of the tumor, which was composed of islands of basaloid cells surrounding variably sized cyst-like spaces forming cribriform structures. The inflammatory infiltrate and stromal fibroblastic tissue were observed around the tumor (B and D). Numerous plasma cells with IgG4 (C and E) and IgG4 (F) were present in the tumor stromal tissue (C) and the inflammatory infiltrate adjacent to the tumor (E and F). Bar 25 μm.