Fig. 1

a An intraoral photograph revealing an ulcerated lesion in the right buccal region. b, c Computed tomography demonstrating a homogeneously enhanced lesion in the right buccal region and multiple, enlarged lymph nodes in the right side of the neck. The largest diameter of the tumor on initial assessment (b) and after induction chemotherapy (d) was 34.2 to 26.0 cm, respectively. The tumor exhibited a reduction in size (d) in response to induction chemotherapy using an intra-arterial infusion of high-dose cisplatin and concurrent peroral TS-1