Magnetic resonance imaging, horizontal cross section, T1-weighted imaging. A rounded cavity is observed in the lingual side of the mandible from the right anterior to the premolar region. The margin of the cavity in the lingual side of the mandible exhibits a cortical bone structure, and the cavity's margin is smooth. A layer of myeloid tissue is observed in the cavity between the lingual cortical bone and the buccal cortical bone. The tissue in the cavity in the lingual side of the mandible has similar signal intensity to the sublingual glands and is contiguous with the sublingual gland tissue.