Figure 1: The findings of neck CT at surgery, FNA cytomorphologic, gross and microscopic examinations of the invasive BCAC specimens. (A) The patient had a complaint of gradual increase in swelling mass (arrows) of the right oral floor, covered by smooth surface of oral mucosa (left). A neck CT scan showed a heterogeneously but mildly enhanced and relatively welldemarcated nodule (in circle), measuring approximately 25 x 15 mm in diameter, arising possibly from the sublingual gland and attached to the right inner side of mandible bone (right). (B) The inadequate cytology specimen (Papanicolaou stains) retrospectively contained some clusters of three-dimensional monomorphic and round basaloid cells having hyperchromatic small nuclei and scant cytoplasm (left), along with a small amount of spherical globules of amorphous material (arrows, left) and myxoid stroma (arrows, right), adjacent to few squamous metaplastic tumor nests (arrowhead, right), without any evidence of necrotic or hemorrhagic backgrounds. Clusters of tumor cells sometimes and likely exhibited peripheral palisading of nuclei around the spherical globules of material (left). Bars = 100 μm (left) and 400 μm (right). (C) A tumor extirpation with combined partial resection of adjacent sublingual gland was performed (inset). Cut surface displayed a relatively firm, non-capsulated and ill-defined nodular lesion, looking grayish to yellowish-white in color. Bar = 1 cm. (D) On scanning magnification, the tumor showed a poorlycircumscribed and uncapsulated nodule, involving the salivary gland and focally invading the surrounding fat (arrows) (H&E stains).