Fig. 2

PET-CT and histopathological analysis of the gingival neoplasm. a PET-CT showed hypermetabolic foci of the upper gingiva (left molar area), which were considered the malignant lesions. b The section of biospy showed metastatic foci of a poorly differentiated adenocarcinoma cells. (hematoxylin and eosin staining, ×100). c–f The IHC investigations of gingival tumor specimens demonstrated immunoreactivity of CK7, CK20, MUC2, and Villin. (Diamino-benzidine staining, ×100)