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Figure 8: Intraoperative determination methods of tumor thickness and resection margin in tongue carcinoma using ultrasonography. (a) A view of the needle placed approximately 10 mm from the deepest portion of the tumor invasion front, with the deep surgical clearance distance verified with live ultrasound monitoring. (b) An ultrasound image of Figure 8(a). The image demonstrating the needle (arrow) placed approximately 10 mm (dotted arrows) from the deepest portion of the tumor invasion front (arrowheads). (c) Resection was performed by the use of an elastic needle (arrows) as a landmark to show the deep surgical clearance of 10 mm. (d) After solidification of the gelatin-embedded specimen, the sample including the tumor in the gelatin-embedded specimen was directly observed by US. (e) An ultrasound image of the sample in Figure 8(d) indicating the appropriate resection placed approximately 10 mm (arrows) from the deepest portion of the tumor invasion front (arrowheads).