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To avoid reirradiation-related complications, tooth extraction near the radiation field should be avoided. The objective of this study was to investigate the predictive factors of late cervical lymph node metastasis in patients with tongue cancer, based on the intraoral ultrasonographic (IUS) findings of the primary tongue lesion. Patients with T1/2N0M0 primary tongue cancer (n=106) were examined using IUS between September 2014 and September 2020. The relationships between the incidence of late cervical lymph node metastasis with the l