Fig 1. Coronal contrast-enhanced T1-weighted images show measured tumor thickness (T), sublingual distance (S), and paralingual distance (P). White arrows show sublingual glands, and a white arrowhead shows the contralateral deep lingual artery. A, MR image of a 51-year-old woman with T2N0 disease shows a vertical black line connecting 2 tumor-mucosa junctions as a reference line. A horizontal white line drawn perpendicular to the reference line represents radiologically determined tumor thickness (T) of 8.7 mm. White line (S) between the tumor and the sublingual space demonstrates the sublingual distance of 0.6 mm. The line (P) between the tumor and the paralingual space demonstrates the paralingual distance of 8.9 mm. B, A 73-year-old man with T1N0 disease (T = 6.2 mm, S = 2.8 mm, P = 6.6 mm). Both patients had no evidence of lymph node metastases for their follow-up duration of >1 year.