PMC4065430_01
Intraoral picture revealing a solitary swelling in the retromolar region
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F1
Clinical examination revealed a 2 x 1.5 cm2 in dimensions, well-circumscribed, lobulated and pinkish mass on the right retromolar area [Figure 1].
Photomicrograph showing neoplastic cells arranged in solid sheets, nests, columns/cords and separated by fibrovascular network (H&E stain, x100)
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F2
Histopathologically, hematoxylin and eosin stained sections revealed a well-circumscribed tumor composed of granular cells that were arranged in solid sheets, alveoli, nests, columns or cords with scattered focal clear cells throughout the tumor tissue, separated by a delicate fibrovascular network [Figure 2].
Photomicrograph showing polygonal tumor cells with centrally placed nuclei and abundant dense granular eosinophilic cytoplasm (H&E stain, x400)
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F3
Abundant cytoplasm, with centrally located nucleus and little mitotic activity were seen [Figure 3].
Photomicrograph showing abundant cytoplasmic granules (PTAH stain, x400). PTAH = Phosphotungstic acid-hematoxylin
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F4
To confirm the diagnosis, phosphotungstic acid-hematoxylin (PTAH) staining was carried out, which revealed abundant coarse cytoplasmic granules that correspond to abundance of mitochondria [Figure 4].