FIG 1. Axial T1-weighted MR image in a 69-year-old woman with lower gingival cancer in the right molar region shows cancer (arrows), which is spreading into the buccal and sublingual spaces (*). The sublingual space is superomedial to the mylohyoid muscle (m). The genioglossus muscle (g) borders the space medially, and the lingual aspect of the mandible borders it anteriorly and laterally. The tumor spreads posteriorly into the retromolar trigone and contiguously from the buccal space.