PMC6457284_01
Clinical presentation of the tumor. Surgical scar on left buccal mucosa (seen inside circle) (a). The residual tumor after excision (b).
CRIPA2019-2074504.001.jpg
PMC6457284_01_CRIPA2019-2074504.001.jpg
fig1
There was no pain on pressure in the region of the scar (Figure 1(a)). The margin was resected under general anesthesia and sent for histopathological examination (Figure 1(b)).
Histopathological features of SC. The excised tissue with areas of minor salivary gland (shown in inset) (a). The mass was composed of tumor cells with eosinophilic cytoplasm and had a microcystic, tubular, papillary cystic structure with eosinophilic secretory material (b, c). Few areas with hemosiderin deposition were also recognized (c). The secretory component stained positive for d-PAS (d).
CRIPA2019-2074504.002.jpg
PMC6457284_01_CRIPA2019-2074504.002.jpg
fig2
Furthermore, normal muscle tissue and atrophied salivary gland tissues were also seen (Figure 2).
Immunohistochemical staining of the tissues. The cells were strongly positive for vimentin (a), S-100 (b), and mammaglobin (c), but negative for DOG-1 (d).
CRIPA2019-2074504.003.jpg
PMC6457284_01_CRIPA2019-2074504.003.jpg
fig3
Mammaglobin was strongly positive, whereas discovered on gastrointestinal stromal tumors 1 (DOG-1) showed a negative reaction (Figure 3).